3 points Lave Computer Scientists and Electrical Engineers are debating who can design the better robots. We can test this scientifically by letting some CS- and EE-student designed robots compete to solve a task (faster times are better), Imagine that we get the following data: Student Degree Time (mm:ss) 1 CS 12:09 2 EE 12:17 3 CS 10:54 4 EE 11:53 5 EE 11:41 6 CS 12:25 7 EE 10:08 Based on these finish times, run a Mann-Whitney U test for the null hypothesis that there is no difference between the median finish times for the two cohorts and fill in the following values using the statistical tables for the p-value. You must fill in the fields exactly as follows: U1 and U2 must be integers representing the two U-values for the test with U1 SU2. In the p box, you must enter exactly three digits representing the first three places after the decimal point from the correct value in the table, eg if you get p-0.05 then enter 050 (to make 0.050). • U1: 02: .p: 0.

the span of {(1,0,0), (1,1,0), (0,1,1)} forms a line in 3D-space.

To determine whether the span of the vectors {(1,0,0), (1,1,0), (0,1,1)} forms a line, plane, or the whole 3D-space, we need to examine the linear independence of these vectors.

If the vectors are linearly dependent, they will lie on a line. If they are linearly independent, they will span a plane. If they span the entire 3D-space, they will be linearly independent.

Let's construct a matrix using these vectors as columns:

A = [1 1 0]

   [0 1 1]

   [0 0 1]

To determine linear independence, we can perform row reduction on the matrix A. If the row-reduced echelon form has a row of zeros, it indicates linear dependence.

Performing row reduction on A, we get:

[R2 - R1, R3 - R1] = [0 1 1]

                     [0 0 1]

                     [0 0 1]

Since the row-reduced echelon form of A has a row of zeros, the vectors are linearly dependent.

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The value of the critical correlation coefficient is approximately 0.342.

The main answer is that at an alpha = 0.01 significance level with a sample size of 50, the value of the critical correlation coefficient is approximately 0.342.

To explain further:

The critical correlation coefficient is a value used in hypothesis testing to determine the rejection region for a correlation coefficient. In this case, we are given an alpha level of 0.01, which represents the maximum probability of making a Type I error (incorrectly rejecting a true null hypothesis).

To find the critical correlation coefficient, we need to refer to a table or use statistical software. By looking up the critical value associated with an alpha level of 0.01 and a sample size of 50 in a table of critical values for the correlation coefficient (such as the table for Pearson's correlation coefficient), we find that the critical correlation coefficient is approximately 0.342.

Therefore, if the calculated correlation coefficient falls outside the range of -0.342 to 0.342, we would reject the null hypothesis at the 0.01 significance level.

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The given graph is shown below:

Given GraphFrom the graph above, it can be observed that the given function is continuous at every point except at

x = -1.85.

Hence, the required interval notation and set-builder notation are:

Interval notation:

(-∞, -1.85) U (-1.85, ∞)

Set-builder notation:

{x | x < -1.85 or x > -1.85}

Therefore, the required interval notation and set-builder notation are:

(-∞, -1.85) U (-1.85, ∞) and {x | x < -1.85 or x > -1.85}, respectively.

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So, it would take approximately 5 hours and 15 minutes to travel 252 miles at an average speed of 48 miles per hour.

To find the time it takes to travel a certain distance, we can use the formula:

Time = Distance / Speed

In this case, the distance is given as 252 miles and the average speed is 48 miles per hour. Plugging these values into the formula, we get:

Time = 252 miles / 48 miles per hour

Simplifying the expression, we find:

Time = 5.25 hours

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The probability of a randomly selected multiple birth falling into a 20-24 age group is 0.0694. To determine the probability, we need to divide the number of multiple births in that age group by the total number of multiple births.

Let's calculate the probabilities for each age group: Age 15-19: 83 multiple births. Probability = 83/6,694 ≈ 0.0124

Age 20-24: 465 multiple births

Probability = 465/6,694 ≈ 0.0694

Age 25-29: 1,635 multiple births

Probability = 1,635/6,694 ≈ 0.2445

Age 30-34: 2,443 multiple births

Probability = 2,443/6,694 ≈ 0.3650

Age 35-39: 1,604 multiple births

Probability = 1,604/6,694 ≈ 0.2399

Age 40-44: 344 multiple births

Probability = 344/6,694 ≈ 0.0514

Age 45-54: 120 multiple births

Probability = 120/6,694 ≈ 0.0179

The probabilities are rounded to four decimal places. These probabilities represent the likelihood of randomly selecting a multiple birth from each age group based on the given data.

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The major axis is along the y-direction, and the minor axis is along the x-direction. The center of the hyperbola is (0, 2).



The given equation is 9x² - 4y² + 16y - 52 = 0. To classify the conic section and write its equation in standard form, we need to complete the square for both x and y terms.

Starting with the x terms, we have 9x². Dividing through by 9, we get x² = (1/9)y².

For the y terms, we have -4y² + 16y. Factoring out -4 from the y terms, we have -4(y² - 4y). Completing the square inside the parentheses, we add (4/2)² = 4 to both sides, resulting in -4(y² - 4y + 4) = -4(4).

Simplifying further, we have -4(y - 2)² = -16.

Combining the x and y terms, we obtain x² - (1/9)y² - 4(y - 2)² = -16.

To write the equation in standard form, we can multiply through by -1 to make the constant term positive. The final equation in standard form is x² - (1/9)y² - 4(y - 2)² = 16.

This equation represents a hyperbola with a horizontal transverse axis centered at (0, 2). The major axis is along the y-direction, and the minor axis is along the x-direction. The center of the hyperbola is (0, 2).

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The derivative of f(x) = 35x^2 ln(x) is given by f'(x) = 70x ln(x) + 35x. Therefore, option (e) 70x is the correct answer.

To find the derivative of f(x) = 35x^2 ln(x), we can apply the product rule and the chain rule of differentiation. The product rule states that the derivative of the product of two functions u(x) and v(x) is given by u'(x)v(x) + u(x)v'(x). In this case, u(x) = 35x^2 and v(x) = ln(x).

Differentiating u(x), we obtain u'(x) = 2 * 35x^(2-1) = 70x. For differentiating v(x), we use the chain rule, which states that if y = f(u(x)), then dy/dx = f'(u(x)) * u'(x). In our case, f(u) = ln(u) and u(x) = x. Differentiating v(x), we have v'(x) = 1/x.

Applying the product rule, we get:

f'(x) = u'(x)v(x) + u(x)v'(x) = 70x ln(x) + 35x.

Therefore, the correct answer is option (e) 70x, which matches the derivative expression obtained. This derivative represents the rate of change of the function f(x) with respect to x and provides information about the slope and behavior of the original function.

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If f'(x) > 0 for 7 < x < 10, f is increasing on (7, 10) because a positive derivative implies positive rate of change.

The derivative, f'(x), represents the instantaneous rate of change of a function. When f'(x) > 0, it indicates that the function is increasing.

In this case, if f'(x) > 0 for 7 < x < 10, it means that the function has a positive rate of change within that interval. As x increases, f(x) will also increase. Therefore, f is increasing on the interval (7, 10).

This can be understood intuitively: if the derivative is positive, it means the function is getting steeper in the positive direction, indicating an overall increase. Hence, the statement is true.

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The critical value for an 80% confidence level is 1.28.

The 80% confidence interval for the average weights of Allen's hummingbirds in the study region can be calculated using the formula:

Confidence Interval = (x - Margin of Error, x + Margin of Error)

To find the margin of error, we need to consider the standard deviation of the population (σ), sample size (n), and the critical value (Zc). The formula for margin of error is:

Margin of Error = Zc * (σ / √n)

Given that the average weight (x) is 3.15 grams, the standard deviation (σ) is 0.40 gram, and the sample size (n) is 13, we can substitute these values into the formula. Using Zc = 1.28, we can calculate the margin of error as follows:

Margin of Error = 1.28 * (0.40 / √13) ≈ 0.47 grams

Therefore, the 80% confidence interval for the average weights of Allen's hummingbirds in the study region is approximately (2.68 grams, 3.62 grams), with a margin of error of 0.47 grams.

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Given, A = 21   B = 921

a. The given information is Mean = (10 + B) = (10 + 921) = 931

Standard Deviation = σ = 8

Sample size = n = 36

Confidence level = 95%

The formula for the confidence interval of the population mean is:

CI = X ± z(σ/√n)

Where X is the sample mean. z is the z-valueσ is the standard deviation n is the sample size We need to find the confidence interval of the population mean at 95% confidence level.

Hence, the confidence interval of the population mean is

CI = X ± z(σ/√n) = 931 ± 1.96(8/√36) = 931 ± 2.66

Therefore, the 95% confidence interval of the population mean is (928.34, 933.66).

b. The given information is the Sample size, n = (7 + A) = (7 + 21) = 28

Standard deviation, σ = 8

Confidence level = 90%

We need to find the 90% confidence interval for the variance.

For that, we use the Chi-Square distribution, which is given by the formula:

(n-1)S²/χ²α/2, n-1) < σ² < (n-1)S²/χ²1-α/2, n-1)

Where S² is the sample variance.

χ²α/2, n-1) is the chi-square value for α/2 significance level and n-1 degrees of freedom.

χ²1-α/2, n-1) is the chi-square value for 1-α/2 significance level and n-1 degrees of freedom.

n is the sample size. Substituting the values in the formula, we get:

(n-1)S²/χ²α/2, n-1) < σ² < (n-1)S²/χ²1-α/2, n-1)(28 - 1)

(8)²/χ²0.05/2, 27) < σ² < (28 - 1) (8)²/χ²0.95/2, 27)(27)

(64)/41.4 < σ² < (27)(64)/13.84

(168.24) < σ² < 1262.74

Therefore, the 90% confidence interval for the variance is (168.24, 1262.74).

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To determine the expected number of components that would last more than 53 months, we can use the properties of the normal distribution. Given a mean of 38 months and a standard deviation of 8 months, we can calculate the z-score corresponding to 53 months using the formula:

z = (x - μ) / σ

where x is the value (53 months), μ is the mean (38 months), and σ is the standard deviation (8 months).

Substituting the values into the formula, we have:

z = (53 - 38) / 8 = 1.875

Next, we need to find the area under the normal curve to the right of this z-score, which represents the probability of a component lasting more than 53 months. We can use a standard normal distribution table or a calculator to find this probability.

Looking up the z-score of 1.875 in the standard normal distribution table, we find that the area to the right is approximately 0.0304.

Finally, to find the expected number of components lasting more than 53 months out of 1000 components, we multiply the probability by the total number of components:

Expected number = probability * total number of components

               = 0.0304 * 1000

               ≈ 30.4

Rounding to the nearest integer, the expected number of components that would last more than 53 months is approximately 30.

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(a) (i) Least-squares regression line: Shear stress at failure = 0.730 * Effective normal stress + 10.867.

(ii) Coefficient of determination: R² ≈ 0.983.

(iii) Residuals = (-4.35, 9.33, 13, 27.67, 38.33, 52), SSE ≈ 2004.408.

(iv) Predicted shear stress at failure for effective normal stress of 160 kN/m²: Shear stress at failure ≈ 118.6 kN/m².

(b) (i) Estimated parameter v of the Poisson distribution: v ≈ 1.46.

(ii) Chi-square goodness-of-fit test: Compare calculated chi-square test statistic with critical value at the 5% significance level to determine if the null hypothesis is rejected or failed to be rejected.

(a) (i) To compute the least-squares regression line for predicting shear stress at failure from normal stress, we can use the given data points (effective normal stress, shear stress at failure) and apply the least-squares method to fit a linear regression model.

We'll use the formula for the slope (B) and intercept (A) of the regression line:

B = (nΣ(xy) - ΣxΣy) / (nΣ(x²) - (Σx)²)

A = (Σy - BΣx) / n

Where n is the number of data points, Σ represents the sum of the respective variable, and (x, y) are the data points.

Effective normal stress (kN/m²): 50, 100, 150, 200, 250, 300

Shear stress at failure (kN/m²): 44, 91, 129, 176, 220, 268

n = 6

Σx = 900

Σy = 928

Σxy = 374,840

Σ(x²) = 270,000

B = (6Σ(xy) - ΣxΣy) / (6Σ(x²) - (Σx)²)

B ≈ 0.730

A = (Σy - BΣx) / n

A ≈ 10.867

Therefore, the least-squares regression line is:

Shear stress at failure = 0.730 * Effective normal stress + 10.867

(ii) To compute the coefficient of determination (R²), we can use the formula:

R² = 1 - SSE / SST

Where SSE is the sum of squares for the error and SST is the total sum of squares.

SSE can be calculated by finding the sum of squared residuals and SST is the sum of squared deviations of the observed shear stress from their mean.

Let's calculate R²:

Observed Shear stress (y) at each effective normal stress (x):

(50, 44), (100, 91), (150, 129), (200, 176), (250, 220), (300, 268)

Using the regression line: Shear stress = 0.730 * Effective normal stress + 10.867

Predicted Shear stress (y') at each effective normal stress (x):

(50, 48.35), (100, 81.67), (150, 115), (200, 148.33), (250, 181.67), (300, 215)

SSE = (44 - 48.35)² + (91 - 81.67)² + (129 - 115)² + (176 - 148.33)² + (220 - 181.67)² + (268 - 215)²

SSE ≈ 2004.408

Mean of observed shear stress = (44 + 91 + 129 + 176 + 220 + 268) / 6 ≈ 150.667

SST = (44 - 150.667)² + (91 - 150.667)² + (129 - 150.667)² + (176 - 150.667)² + (220 - 150.667)² + (268 - 150.667)²

SST ≈ 123388.667

R² = 1 - SSE / SST

R² ≈ 1 - 2004.408 / 123388.667

R² ≈ 0.983

Therefore, the coefficient of determination is approximately 0.983.

(iii) To compute the residual for each point and the sum of squares for the error (SSE), we'll use the observed shear stress (y), predicted shear stress (y'), and the formula for SSE:

Residual = y - y'

SSE = Σ(residual)²

Observed Shear stress (y) at each effective normal stress (x):

(50, 44), (100, 91), (150, 129), (200, 176), (250, 220), (300, 268)

Predicted Shear stress (y') at each effective normal stress (x):

(50, 48.35), (100, 81.67), (150, 115), (200, 148.33), (250, 181.67), (300, 215)

Calculating residuals and SSE:

Residuals: (-4.35, 9.33, 13, 27.67, 38.33, 52)

SSE = (-4.35)² + (9.33)² + (13)² + (27.67)² + (38.33)² + (52)²

SSE ≈ 2004.408

Therefore, the residuals for each point are (-4.35, 9.33, 13, 27.67, 38.33, 52), and the sum of squares for the error (SSE) is approximately 2004.408.

(iv) To predict the shear stress at failure if the effective normal stress is 160 kN/m², we can use the regression line equation:

Shear stress at failure = 0.730 * Effective normal stress + 10.867

Substituting the value of the effective normal stress (x = 160) into the equation:

Shear stress at failure = 0.730 * 160 + 10.867

Shear stress at failure ≈ 118.6 kN/m²

Therefore, if the effective normal stress is 160 kN/m², the predicted shear stress at failure is approximately 118.6 kN/m².

(b) (i)To estimate the parameter v of the Poisson distribution by the method of moments, we can equate the mean (μ) of the Poisson distribution to the parameter v:

μ = v

The mean can be estimated using the given frequencies and the assumption that the occurrence of fatal accidents follows a Poisson process.

Given frequencies:

0 accidents: 13 years

1 accident: 15 years

2 accidents: 12 years

3 accidents: 6 years

4 accidents: 4 years

Mean (sample mean) = (0 * 13 + 1 * 15 + 2 * 12 + 3 * 6 + 4 * 4) / (13 + 15 + 12 + 6 + 4)

Mean ≈ 1.46

Therefore, the estimated parameter v of the Poisson distribution by the method of moments is approximately 1.46.

(ii) Performing the chi-square goodness-of-fit test for the given data with observed frequencies (0, 1, 2, 3, 4) and the estimated parameter v, we compare the calculated chi-square test statistic with the critical value to determine if the null hypothesis is rejected or not at the 5% significance level.

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The answer based on the Elementary Topology is  we conclude that AU B is connected. Hence, the proof by below given solution.

Let A and B be two connected sets such that An B +0.

To prove that AU B is also connected, we need to show that there exists no separation of the union set into two non-empty, disjoint and open sets (or the union is connected).

Proof:

Assume that AU B is not connected and there exists a separation of the union set into two non-empty, disjoint and open sets, say C and D.

Since A and B are connected, they cannot be split into two non-empty, disjoint and open sets.

Hence, the sets C and D must contain parts of both A and B.

WLOG, let's say that C contains a part of A and B.

Thus, we have:

C = (A∩C) U (B∩C)

Now, (A∩C) and (B∩C) are non-empty, disjoint and open in A and B respectively.

Moreover, they are also non-empty and form a separation of A∩B, which contradicts the assumption that A∩B is connected.

Therefore, our assumption that AU B is not connected is incorrect.

Thus, we conclude that AU B is connected.

Hence, the proof.

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Function g has non-constant elasticity of substitution and does not satisfy the Inada condition for all inputs. Therefore, it is not a homothetic function.

A homothetic function is a function of a particular form in economics and mathematics. It is a function where the structure remains the same even when the magnitudes change. This means that it does not change its properties even when there is a proportional change in the inputs or the parameters. Hence, it is a class of functions in which the ratio of the parameters determines the outcomes. Therefore, it is said that homothetic functions possess constant elasticity of substitution (CES) and satisfy the Inada condition for all inputs.

A homothetic function, f is a production function or utility function that has constant returns to scale. Hence, it is said that a homothetic function has a unique property of constant elasticities of substitution. The homothetic functions have a certain form of homogeneity that leads to scale invariance. Hence, it implies that the functions that have the same form as the homothetic function but have different coefficients, are still homothetic functions. Thus, if a function has the same structure and elasticity of substitution, it is considered a homothetic function.

Given the two functions:

f(x1,...,xn) = A(8₁x₁ +82x2 + ... + ₂x)
g(x1, x2) = 2logr1 + 5logr2

The functions f and g are not homothetic. This is because f is a homogeneous function that satisfies the property of constant elasticity of substitution and the Inada condition for all inputs, whereas g does not.

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The functions f and g are not homothetic. This is because f is a homogeneous function that satisfies the property of constant elasticity of substitution and the Inada condition for all inputs, whereas g does not.

Here, we have,

Function g has non-constant elasticity of substitution and does not satisfy the Inada condition for all inputs. Therefore, it is not a homothetic function.

A homothetic function is a function of a particular form in economics and mathematics. It is a function where the structure remains the same even when the magnitudes change. This means that it does not change its properties even when there is a proportional change in the inputs or the parameters. Hence, it is a class of functions in which the ratio of the parameters determines the outcomes. Therefore, it is said that homothetic functions possess constant elasticity of substitution (CES) and satisfy the Inada condition for all inputs.

A homothetic function, f is a production function or utility function that has constant returns to scale. Hence, it is said that a homothetic function has a unique property of constant elasticities of substitution. The homothetic functions have a certain form of homogeneity that leads to scale invariance. Hence, it implies that the functions that have the same form as the homothetic function but have different coefficients, are still homothetic functions. Thus, if a function has the same structure and elasticity of substitution, it is considered a homothetic function.

Given the two functions:

f(x₁,...,xₙ) = A(8₁x₁ +8₂x₂ + ... + ₂x)

g(x₁, x₂) = 2logr₁ + 5logr₂

The functions f and g are not homothetic. This is because f is a homogeneous function that satisfies the property of constant elasticity of substitution and the Inada condition for all inputs, whereas g does not.

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The lower and upper control limits of the R-chart are 3.92 and 10.47, respectively.

To calculate the control limits for the R-chart, we need to use the range (R) values provided. The R-chart is used to monitor the variability or dispersion within the process.

Step 1: Calculate the average range (R-bar):

R-bar = (R1 + R2 + R3 + R4 + R5) / 5

R-bar = (9.90 + 7.73 + 6.89 + 7.56 + 7.5) / 5

R-bar = 39.58 / 5

R-bar = 7.92

Step 2: Calculate the lower control limit (LCL) for the R-chart:

LCL = D3 * R-bar

D3 is a constant value based on the sample size, and for n = 4, D3 is equal to 0.0.

LCL = 0.0 * R-bar

LCL = 0.0 * 7.92

LCL = 0.00

Step 3: Calculate the upper control limit (UCL) for the R-chart:

UCL = D4 * R-bar

D4 is a constant value based on the sample size, and for n = 4, D4 is equal to 2.282.

UCL = 2.282 * R-bar

UCL = 2.282 * 7.92

UCL = 18.07

Therefore, the lower control limit (LCL) for the R-chart is 0.00, and the upper control limit (UCL) is 18.07.

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To determine if vector X can be expressed as a linear combination of the vectors in set S, we need to check if there exist coefficients such that a linear combination of the vectors in S equals vector X.

To determine if vector X can be expressed as a linear combination of the vectors in set S, we need to check if there exist coefficients (scalars) such that a linear combination of the vectors in S equals vector X. If such coefficients exist, then vector X can be expressed as a linear combination of the vectors in S, and the statement is true.

If no such coefficients exist, then vector X cannot be expressed as a linear combination of the vectors in S, and the statement is false. This determination can be made by solving a system of linear equations or performing matrix operations.

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The Principle of Inclusion and Exclusion is a counting principle used in combinatorics to calculate the size of the union of multiple sets. It helps to determine the number of elements that belong to at least one of the sets when dealing with overlapping or intersecting sets.

The principle states that if we want to count the number of elements in the union of multiple sets, we should add the sizes of individual sets and then subtract the sizes of their intersections to avoid double-counting. Mathematically, it can be expressed as:

[tex]|A \cup B \cup C| = |A| + |B| + |C| - |A \cap B| - |A \cap C| - |B \cap C| + |A \cap B \cap C|[/tex]

This principle is used in various areas of mathematics, including combinatorics and probability theory. It allows us to efficiently calculate the size of complex sets or events by breaking them down into simpler components.

For example, let's consider a group of students who study different subjects: Math, Science, and English. We want to count the number of students who study at least one of these subjects. Suppose there are 20 students who study Math, 25 students who study Science, 15 students who study English, 10 students who study both Math and Science, 8 students who study both Math and English, and 5 students who study both Science and English.

Using the Principle of Inclusion and Exclusion, we can calculate the total number of students who study at least one subject:

[tex]\(|Math \cup Science \cup English| = |Math| + |Science| + |English| - |Math \cap Science| - |Math \cap English| - |Science \cap English| + |Math \cap Science \cap English|\)[/tex]

[tex]= 20 + 25 + 15 - 10 - 8 - 5 + 0\\= 37[/tex]

Therefore, there are 37 students who study at least one of the three subjects.

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For the estimator s_0 to be unbiased, the condition is that the coefficient of y, denoted as d, should be equal to zero.

3a) To determine when s_0 is an unbiased estimator of y, we need to calculate its expected value E(s_0) and check if it equals y.

The estimator s_0 is given by s_0 = c + dy. We want to find the values of c and d such that E(s_0) = E(c + dy) = y.

Taking the expectation of s_0, we have:

E(s_0) = E(c + dy) = c + dE(y)

Since E(y) = μ, where μ represents the population mean, we can rewrite the equation as:

E(s_0) = c + d*μ

For s_0 to be an unbiased estimator, E(s_0) should be equal to the true population parameter y. Therefore, we require:

c + d*μ = y

This equation implies that c should be equal to y minus d multiplied by μ:

c = y - d*μ

Substituting this value of c back into the expression for s_0, we get:

s_0 = (y - dμ) + dy = (1 + d)y - dμ

To make s_0 an unbiased estimator, we need the coefficient of y, (1 + d), to be equal to zero:

1 + d = 0

d = -1

Therefore, the condition for s_0 to be an unbiased estimator is that d = -1.

3b) With d = -1, we substitute this value back into the expression for s_0:

s_0 = (-1)*y + y = y

This means that the estimator s_0, now a function of c only, simplifies to y, which is the true population parameter.

The variance of s_0 in terms of σ^2 and d can be calculated as follows:

Var(s_0) = Var((-1)y + y) = Var(0y) = 0*Var(y) = 0

Therefore, the variance of s_0 is zero when d = -1.

Intuition: When d = -1, the estimator s_0 becomes a constant y. Since a constant has no variability, the variance of s_0 becomes zero, which means the estimator perfectly estimates the true population parameter without any uncertainty.

3c) When Var(y1) = σ1^2 and Var(y2) = σ2^2 are unequal, we can find the value of d that minimizes the variance expression for s_0.

The variance of s_0 in terms of σ1^2, σ2^2, and d is given by:

Var(s_0) = Var((1 + d)y - dμ) = [(1 + d)^2 * σ1^2] + [(-d)^2 * σ2^2]

Expanding and simplifying the expression, we get:

Var(s_0) = (1 + 2d + d^2) * σ1^2 + d^2 * σ2^2

To find the value of d that minimizes the variance, we differentiate the expression with respect to d and set it equal to zero:

d(Var(s_0))/dd = 2σ1^2 + 2d * σ1^2 - 2d * σ2^2 = 0

Simplifying further, we have:

2σ1^2 + 2d * (σ1^2 - σ2^2) = 0

Dividing both sides by 2 and rearranging, we find:

d = -σ1^2 / (σ1^2 - σ2^2)

Therefore, the value of d that minimizes the variance expression is -σ1^2 / (σ1^2 - σ2^2).

Intuition: The value of d that minimizes the variance depends on the relative sizes of σ1^2 and σ2^2. When σ1^2 is much larger than σ2^2, the denominator σ1^2 - σ2^2 becomes positive, and d will be a negative value. On the other hand, when σ2^2 is larger than σ1^2, the denominator becomes negative, and d will be a positive value. This adjustment in d helps balance the contribution of y1 and y2 to the estimator, considering their respective variances.

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Suppose a population of observations is normally distributed. We need to find the value of Z* so that 95% of the observations in the population are between -z* and +z* on the Z scale.

In a normal distribution, the mean of the distribution is represented by μ and the standard deviation is represented by σ. The Z score is the number of standard deviations a particular observation is from the mean. The formula for calculating the Z score is as follows:z = (x - μ) / σ Now, we need to find the value of Z* that contains 95% of the area under the normal curve on both sides of the mean. This is called the critical value, which can be found using a Z-score table or a calculator.Using a Z-score table, we find that the Z-score for a 95% confidence interval is 1.96. This means that 95% of the observations in the population are between -1.96 and +1.96 on the Z scale. Therefore, the value of Z* is 1.96. Using a Z-score table, we find that the Z-score for a 95% confidence interval is 1.96. This means that 95% of the observations in the population are between -1.96 and +1.96 on the Z scale.

The Z-score is a useful tool for standardizing a normal distribution, allowing us to compare different distributions with different means and standard deviations on the same scale.

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(a) The team can be chosen in (4 choose 0) * (5 choose 5) + (4 choose 1) * (5 choose 4) + (4 choose 2) * (5 choose 3) + (4 choose 3) * (5 choose 2) + (4 choose 4) * (5 choose 1) = 1 + 20 + 30 + 20 + 5 = 76 ways.

(b) The team can be chosen with just three women in (4 choose 2) * (5 choose 3) = 6 * 10 = 60 ways.

(c) The probability that the team includes just 3 women is given by the number of ways to choose a team with 3 women and 2 men (60 ways) divided by the total number of ways to choose a team (76 ways), so the probability is 60/76 ≈ 0.7895.

(d) The probability that the team includes at least three women is given by the number of ways to choose a team with at least three women (60 ways) divided by the total number of ways to choose a team (76 ways), so the probability is 60/76 ≈ 0.7895.

(e) The probability that the team includes more men than women is given by the number of ways to choose a team with more men than women (0 ways) divided by the total number of ways to choose a team (76 ways), so the probability is 0/76 = 0.

(a) The purpose of plotting a scatter diagram in regression analysis is to visually explore the relationship between two variables. It helps in determining whether there is a correlation between the variables, and if so, the nature and strength of the correlation.

(b) (i) A strong direct linear relationship between variables X and Y would be represented by a scatter diagram where the points are closely clustered along a straight line that rises from left to right.

(ii) A weak inverse linear relationship between variables X and Y would be represented by a scatter diagram where the points are loosely scattered along a line that slopes downwards from left to right.

(c) The linear regression equation of Y on X can be determined by fitting a line that best represents the relationship between the variables. This line can be obtained through methods such as the least squares regression.

(ii) To predict the value of Y for X = 3, we can substitute the value of X into the linear regression equation obtained in part (c).

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Answer:

So the correct option is:

d) x = (3 ± √13) / 2

Step-by-step explanation:

To find the solutions of the equation x^2 - 3x - 1 = 0 using the quadratic formula, which is x = (-b ± √(b^2 - 4ac)) / (2a), we can identify the values of a, b, and c from the given equation.

a = 1

b = -3

c = -1

Substituting these values into the quadratic formula, we get:

x = (-(-3) ± √((-3)^2 - 4(1)(-1))) / (2(1))

Simplifying further:

x = (3 ± √(9 + 4)) / 2

x = (3 ± √13) / 2

Therefore, the exact solutions of the equation x^2 - 3x - 1 = 0 are:

x = (3 + √13) / 2

x = (3 - √13) / 2

Answer:

c. x = the quantity of 3 plus or minus the square root of 13 all over 2

Step-by-step explanation:

Using quadratic formula with a = 1, b = -3, and c = -1.

x = [-(-3) ± √{(-3)^2 - 4(1)(-1)}] / ]2(1)]

x = (3 ± √13)/2

The equation of the plane that is tangent to z = f(x, y) at the point (1, 2, 27) is 9x + 22y - z - 166 = 0.

Given the surface z = f(x,y) = x³ + x² + 2xy + 5y², we have to answer the following questions:

(a) To find the partial derivative fx, we need to find the derivative of z with respect to x by treating y as a constant.

                    f(x, y) = x³ + x² + 2xy + 5y²∂z/∂x

                            = 3x² + 2x + 2yfx(x, y)

                             = 3x² + 2x + 2y

Now, substituting x = 1 and y = 2,fx(1, 2) = 3(1)² + 2(1) + 2(2) = 9

(b) To find the partial derivative fy, we need to find the derivative of z with respect to y by treating x as a constant.f(x, y) = x³ + x² + 2xy + 5y²∂z/∂y = 2x + 10yfy(x, y) = 2x + 10y

Now, substituting x = 1 and y = 2,fy(1, 2) = 2(1) + 10(2) = 22

(c) To find the coordinates of the point on the surface where x = 1 and y = 2, we need to substitute x = 1 and y = 2 into the given equation.

z = f(x, y) = x³ + x² + 2xy + 5y²At x = 1 and y = 2,z = f(1, 2) = (1)³ + (1)² + 2(1)(2) + 5(2)² = 27

Therefore, the coordinates of the point on the surface where x = 1 and y = 2 are (1, 2, 27).

(d) To find the equation of the plane that is tangent to the surface at the point (1, 2, 27), we need to use the formula for the equation of a plane in 3D space, which is given by:ax + by + cz + d = 0where a, b, and c are the coefficients of x, y, and z, respectively, and d is the constant term.

To obtain a tangent plane to the surface, we need to find the normal vector, n, at the point (1, 2, 27).

The normal vector, n, is given by:n = [fx(1, 2), fy(1, 2), -1] = [9, 22, -1]

Next, we need to find d by substituting the point (1, 2, 27) and the normal vector [9, 22, -1] into the equation of the plane.

                          ax + by + cz + d = 0

                 ⇒ 9(x-1) + 22(y-2) - (z-27) + d = 0

                  ⇒ 9x + 22y - z - 166 = 0

Therefore, the equation of the plane that is tangent to z = f(x, y) at the point (1, 2, 27) is 9x + 22y - z - 166 = 0.

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For finding the Laplace transforms, we need to apply the properties and formulas of Laplace transforms, such as linearity, shifting, derivatives, and known transforms of basic functions.

The list consists of various Laplace transform expressions. By applying these properties and formulas, we can simplify the expressions and evaluate their corresponding Laplace transforms.

The Laplace transform of cos²(41) can be found by using the identity cos²(x) = (1/2)(1 + cos(2x)). Therefore, the Laplace transform of cos²(41) is (1/2)(1 + L{cos(82)}).

The Laplace transform of 1 (a constant function) is 1/s.

To find the Laplace transform of e²(t-1)², we can use the shifting property of the Laplace transform. The Laplace transform of e^(at)f(t) is F(s-a), where F(s) is the Laplace transform of f(t). Therefore, the Laplace transform of e²(t-1)² is e²L{(t-1)²}.

The Laplace transform of test cos(4t) can be evaluated by finding the Laplace transform of each term separately. The Laplace transform of te^(at) is -dF(s)/ds, and the Laplace transform of cos(4t) is s/(s² + 16). Therefore, the Laplace transform of test cos(4t) is -d/ds(s/(s² + 16)).

The Laplace transform of ²u(1-2) can be calculated by applying the Laplace transform to each term individually. The Laplace transform of a constant multiplied by the unit step function u(t-a) is e^(-as)F(s), where F(s) is the Laplace transform of f(t). Therefore, the Laplace transform of ²u(1-2) is ²e^(-2s)L{u(1)}.

The expression (31+1)u(1-1) simplifies to 32L{u(0)}, as u(1-1) equals 1 for t < 1 and 0 otherwise. The Laplace transform of a constant function is the constant divided by s.

The Laplace transform of u(1-4) simplifies to L{u(-3)}, which is 1/s.

The Laplace transform of t¹u(1-4) can be found by multiplying the Laplace transform of t by the Laplace transform of u(1-4). The Laplace transform of t is 1/s², and the Laplace transform of u(1-4) is e^(-3s)/s. Therefore, the Laplace transform of t¹u(1-4) is (1/s²) * (e^(-3s)/s).

The Laplace transform of e*(1-2) simplifies to e*L{(1-2)}.

The Laplace transform of 2*** depends on the specific function represented by ***.

The Laplace transform of sin(4et) can be found by applying the Laplace transform to each term individually. The Laplace transform of sin(at) is a/(s² + a²). Therefore, the Laplace transform of sin(4et) is 4eL{sin(4t)}.

The Laplace transform of {3} is not specified.

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The periodic function is given by;$$f(x) = x + \pi, -\pi \le x < 0$$$$f(x) = x - \pi, 0 \le x < \pi$$

We are to determine the Fourier series of the function.

To find the Fourier series of the given function, we use the Fourier series formulae given as;

[tex]$$a_0 = \frac{1}{2L}\int_{-L}^Lf(x)dx$$$$a_n = \frac{1}{L}\int_{-L}^Lf(x)\cos(\frac{n\pi x}{L})dx$$$$b_n = \frac{1}{L}\int_{-L}^Lf(x)\sin(\frac{n\pi x}{L})dx$$[/tex]

The value of L in the interval that is given is L = π.

Thus;$$a_0 = \frac{1}{2\pi}\int_{-\pi}^{\pi}f(x)dx$$$$ = \frac{1}{2\pi}[\int_{-\pi}^{0}(x + \pi)dx + \int_{0}^{\pi}(x - \pi)dx]$$$$ = \frac{1}{2\pi}[\frac{1}{2}(x^2 + 2\pi x)|_{-\pi}^{0} + \frac{1}{2}(x^2 - 2\pi x)|_{0}^{\pi}]$$$$ = \frac{1}{2\pi}[(-\frac{\pi^2}{2} - \pi^2) + (\frac{\pi^2}{2} - \pi^2)]$$$$ = 0$$

To determine aₙ;$$a_n = \frac{1}{\pi}\int_{-\pi}^{\pi}f(x)\cos(nx)dx$$$$ = \frac{1}{\pi}[\int_{-\pi}^{0}(x+\pi)\cos(nx)dx + \int_{0}^{\pi}(x-\pi)\cos(nx)dx]$$

We will consider the integrals separately;$$\int_{-\pi}^{0}(x+\pi)\cos(nx)dx$$$$ = [\frac{1}{n}(x + \pi)\sin(nx)]_{-\pi}^0 - \int_{-\pi}^{0}\frac{1}{n}\sin(nx)dx$$$$ = \frac{\pi}{n}\sin(n\pi) + \frac{1}{n^2}[\cos(nx)]_{-\pi}^0$$$$ = \frac{(-1)^{n+1}\pi}{n} - \frac{1}{n^2}(1 - \cos(n\pi))$$

When n is odd, cos(nπ) = -1,

hence;$$a_n = \frac{1}{\pi}[\frac{(-1)^{n+1}\pi}{n} + \frac{1}{n^2}(1 - (-1))]$$$$ = \frac{2}{n^2\pi}$$

when n is even, cos(nπ) = 1, hence;$$a_n = \frac{1}{\pi}[\frac{(-1)^{n+1}\pi}{n} + \frac{1}{n^2}(1 - 1)]$$$$ = \frac{(-1)^{n+1}}{n}$$Thus, $$a_n = \begin{cases} \frac{2}{n^2\pi}, \text{if } n \text{ is odd}\\ \frac{(-1)^{n+1}}{n}, \text{if } n \text{ is even}\end{cases}$$

To determine bₙ;$$b_n = \frac{1}{\pi}\int_{-\pi}^{\pi}f(x)\sin(nx)dx$$$$ = \frac{1}{\pi}[\int_{-\pi}^{0}(x+\pi)\sin(nx)dx + \int_{0}^{\pi}(x-\pi)\sin(nx)dx]$$

We will consider the integrals separately;$$\int_{-\pi}^{0}(x+\pi)\sin(nx)dx$$$$ = -[\frac{1}{n}(x+\pi)\cos(nx)]_{-\pi}^0 + \int_{-\pi}^{0}\frac{1}{n}\cos(nx)dx$$$$ = \frac{(-1)^{n+1}\pi}{n} + \frac{1}{n^2}[\sin(nx)]_{-\pi}^0$$$$ = \frac{(-1)^n\pi}{n}$$

When n is odd, bₙ = 0 since the integral of an odd function over a symmetric interval is equal to zero.

Hence,$$b_n = \begin{cases} \frac{(-1)^n\pi}{n}, \text{if } n \text{ is even}\\ 0, \text{if } n \text{ is odd}\end{cases}$$

Therefore, the Fourier series of the function f(x) is;

[tex]$$f(x) = \frac{\pi}{2} - \frac{4}{\pi}\sum_{n=1}^{\infty}\frac{\cos((2n-1)x)}{(2n-1)^2}, -\pi \le x < 0$$$$ = -\frac{\pi}{2} - \sum_{n=1}^{\infty}\frac{\sin(2nx)}{n}, 0 \le x < \pi$$[/tex]

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With the given function. , our integration is correct .Check:

[tex](8x - \frac{1}{2} x^2)'=8 - x[/tex]

This is the final answer:

[tex]$$ \int (8 - x) \text{ }dx = 8x - \frac{1}{2} x^2 + C $$[/tex]

[tex]$$ \int (8 - x) \text{ }dx $$[/tex]

Formula: Let f(x) be a function defined on an interval I, and let F be the antiderivative of f, that is,

[tex]$F'(x)=f(x)$[/tex] on I, t

hen the indefinite integral of f is defined by

[tex]$$ \int f(x)dx=F(x)+C $$[/tex]

where C is an arbitrary constant of integration.

Now, we have to find the indefinite integral of the given function:

[tex]$$ \int (8 - x) \text{ }dx $$[/tex]

Let's use the formula and integrate:

[tex]$\int (8-x)\text{ }dx $[/tex]

Using integration, we get

[tex]$$\int (8-x)\text{ }dx = 8x - \frac{1}{2} x^2 + C$$[/tex]

Check the result by differentiation.

We can check whether our integration is correct or not by differentiating the result that we got above with respect to x.
Let's differentiate it. Using differentiation, we get:

[tex](8x - \frac{1}{2} x^2 + C)'=8 - x[/tex]

We can see that the differentiation of the result matches

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To draw the graph G(V, E) where V = {a, b, c, d, e, f, and E = {ab, ad, bc, cd, cf, de, df), we first identify all the vertices and edges of the graph as follows: V = {a, b, c, d, e, f}E = {ab, ad, bc, cd, cf, de, df}. From the above definition of the vertices and edges, we can use a diagram to represent the graph.

The diagram above represents the graph G(V, E) where V = {a, b, c, d, e, f, and E = {ab, ad, bc, cd, cf, de, df).The diagram above shows that we can connect the vertices to form edges to complete the graph G(V, E) as follows: a is connected to b, and d, thus (a, b) and (a, d) are edges b is connected to c and a, thus (b, c) and (b, a) are edges c is connected to b and d, thus (c, b) and (c, d) are edges d is connected to a, c, e, and f, thus (d, a), (d, c), (d, e) and (d, f) are edges e is connected to d, and f, thus (e, d) and (e, f) are edges f is connected to c and d, thus (f, c) and (f, d) are edges

The graph G(V, E) where V = {a, b, c, d, e, f, and E = {ab, ad, bc, cd, cf, de, df) consists of vertices and edges. To represent the graph, we identify the vertices and connect them to form edges. The diagram above shows the completed graph. In the diagram, we represented the vertices by dots and the edges by lines connecting the vertices. From the diagram, we can see that each vertex is connected to other vertices by the edges. Thus, we can traverse the graph by moving from one vertex to another using the edges.

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This is the equation of the tangent line to the graph of the function f(x) = sin(3√x) at the point (π², 0).

The equation of the tangent line to the graph of the function f(x) = sin(3√x) at the point (π², 0) can be found using the concept of the derivative. First, we need to find the derivative of f(x),

which represents the slope of the tangent line at any given point. Then, we can use the point-slope form of a linear equation to determine the equation of the tangent line.

The derivative of f(x) can be found using the chain rule. Let u = 3√x, then f(x) = sin(u). Applying the chain rule, we have: f'(x) = cos(u) * d(u)/d(x)

To find d(u)/d(x), we differentiate u with respect to x:

d(u)/d(x) = d(3√x)/d(x) = 3/(2√x)

Substituting this back into the equation for f'(x), we have:

f'(x) = cos(u) * (3/(2√x))

Since f'(x) represents the slope of the tangent line, we can evaluate it at the given point (π², 0):

f'(π²) = cos(3√π²) * (3/(2√π²))

Simplifying this expression, we have:

f'(π²) = cos(3π) * (3/(2π))

Since cos(3π) = -1, the slope of the tangent line is:

m = f'(π²) = -3/(2π)

Now that we have the slope of the tangent line, we can use the point-slope form of a linear equation to find the equation of the tangent line. Using the point (π², 0), we have: y - y₁ = m(x - x₁)

Substituting the values, we get:

y - 0 = (-3/(2π))(x - π²)

Simplifying further, we obtain the equation of the tangent line:

y = (-3/(2π))(x - π²)

This is the equation of the tangent line to the graph of the function f(x) = sin(3√x) at the point (π², 0).

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Since V satisfies all ten axioms, we can conclude that V is a vector space

To determine if V is a vector space, we need to check if it satisfies the ten axioms that define a vector space. Let's go through each axiom:

1. Closure under addition:

  For any u, v in V, the sum u + v is defined as uv + uv. Since the sum of real numbers is also a real number, the closure under addition holds.

2. Commutativity of addition:

  For any u, v in V, u + v = uv + uv = vu + vu = v + u. Thus, commutativity of addition holds.

3. Associativity of addition:

  For any u, v, w in V, (u + v) + w = (uv + uv) + w = uvw + uvw = u + (vw + vw) = u + (v + w). Therefore, associativity of addition holds.

4. Identity element for addition:

  There exists an element 0 in V such that for any u in V, u + 0 = uv + uv = u. In this case, the identity element is 0 = 0v + 0v = 0. Thus, the identity element for addition exists.

5. Inverse elements for addition:

  For any u in V, there exists an element -u in V such that u + (-u) = uv + uv + (-uv - uv) = 0. Therefore, inverse elements for addition exist.

6. Closure under scalar multiplication:

  For any scalar a and u in V, the scalar multiplication a*u is defined as a(uv + uv) = auv + auv. Since the product of a scalar and a real number is a real number, closure under scalar multiplication holds.

7. Identity element for scalar multiplication:

  For any u in V, 1*u = 1(uv + uv) = uv + uv = u. Thus, the identity element for scalar multiplication exists.

8. Distributivity of scalar multiplication with respect to addition:

  For any scalar a, b and u in V, a * (u + v) = a(uv + uv) = auv + auv and (a + b) * u = (a + b)(uv + uv) = a(uv + uv) + b(uv + uv) = auv + auv + buv + buv. Therefore, distributivity of scalar multiplication with respect to addition holds.

9. Distributivity of scalar multiplication with respect to scalar addition:

  For any scalar a and u in V, (a + b) * u = (a + b)(uv + uv) = auv + auv + buv + buv. Also, a * u + b * u = a(uv + uv) + b(uv + uv) = auv + auv + buv + buv. Therefore, distributivity of scalar multiplication with respect to scalar addition holds.

10. Compatibility of scalar multiplication with scalar multiplication:

   For any scalars a, b and u in V, (ab) * u = (ab)(uv + uv) = abuv + abuv = a(b(uv + uv)) = a * (b * u). Thus, compatibility of scalar multiplication with scalar multiplication holds.

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We need to determine the correlation coefficient between variables X and Y. The variance of X is known to be 9, and the regression lines for X and Y are provided as 8X - 10Y + 66 = 0 and 40X - 18Y = 214, respectively.

To find the correlation coefficient between X and Y, we can use the formula for the slope of the regression line. The slope is given by the ratio of the covariance of X and Y to the variance of X. In this case, we have the regression line 8X - 10Y + 66 = 0, which implies that the slope of the regression line is 8/10 = 0.8.

Since the slope of the regression line is equal to the correlation coefficient multiplied by the standard deviation of Y divided by the standard deviation of X, we can write the equation as 0.8 = ρ * σY / σX.

Given that the variance of X is 9, we can calculate the standard deviation of X as √9 = 3.

By rearranging the equation, we have ρ = (0.8 * σX) / σY.

However, the standard deviation of Y is not provided, so we cannot determine the correlation coefficient without additional information.

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The set {p₁(x), p₂(x), p₃(x)} does not form a basis for Span {p₁(x), p₂(x), p₃(x)}. To determine whether a set of vectors forms a basis for a given vector space, we need to check two conditions: linear independence and spanning the vector space.

First, let's check for linear independence. We can do this by setting up a linear combination of the vectors equal to the zero vector and solving for the coefficients. In this case, we have:

a₁p₁(x) + a₂p₂(x) + a₃p₃(x) = 0

Substituting the given polynomials, we get:

(a₁(1−2x²−2x³) + a₂(−1+x+x³) + a₃(x−x²+3x²) = 0

Expanding and simplifying, we have:

(−2a₁ + a₂ + a₃) + (−2a₁ + a₂ − a₃)x² + (−2a₃)x³ = 0

For this equation to hold true for all values of x, each coefficient must be zero. Therefore, we have the following system of equations:

-2a₁ + a₂ + a₃ = 0     (1)

-2a₁ + a₂ - a₃ = 0     (2)

-2a₃ = 0              (3)

From equation (3), we can see that a₃ must be zero. Substituting this into equations (1) and (2), we get:

-2a₁ + a₂ = 0     (4)

-2a₁ + a₂ = 0     (5)

Equations (4) and (5) are equivalent, indicating that there are infinitely many solutions to the system. Therefore, the set of vectors {p₁(x), p₂(x), p₃(x)} is linearly dependent and cannot form a basis for Span {p₁(x), p₂(x), p₃(x)}.

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