Identify the key elements. For each of the following scenarios, identify the populations, the counts, and the sample sizes; compute the two proportions and find their difference. a. A study of tipping behaviors examined the relationship between the color of the shirt worn by the server and whether or not the 20 customer left a tip.2 There were 418 male customers in the study. Of the 69 customers served by a server wearing a red shirt, 40 left a tip. Of the 349 who were served by a server wearing a shirt of a different color, 130 left a tip. b. A sample of 40 runners was used to compare two new routines for stretching. The runners were randomly assigned to one of the routines, which they followed for two weeks. Satisfaction with the routines was measured using а questionnaire at the end of the two-week period. For the first routine, 11 runners said that they were satisfied or very satisfied. For the second routine, 14 runners said that they were satisfied or very satisfied.

Answer:

The coupon represents a sales promotion tool in the promotion mix.

there are 1500 different super subs that can be made.

What is combination?

In mathematics, a combination is a way of selecting objects from a set, where the order in which the objects are selected does not matter. Combinations are used in various areas of mathematics and statistics, as well as in real-world applications such as probability theory, genetics, and computer science.

For the toppings, we have to choose 4 out of the 6 available, so the number of ways to do that is:

6C4

=15

This is the number of combinations of 4 toppings that can be chosen from 6.

For the condiments, we have to choose 3 out of the 6 available, so the number of ways to do that is:

6C3

=20

This is the number of combinations of 3 condiments that can be chosen from 6.

Finally, we have 5 choices of bread.

Therefore, the total number of different super subs that can be made is:

15*20*5 = 1500

So there are 1500 different super subs that can be made.

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The value of x in the given figure consists of Central angle and Inscribed Angle is given by, x = 2.

We know that the inscribed for a semi circle is 90 degrees.

Clearly the inscribed angle for the given figure is 90 degrees.

And rest angles of the inscribed triangle are (11x - 4) and (16x + 40) degrees.

So, the sum of the rest angles must be 90 degrees too since the sum of all interior angles of triangle is 180 degree according to the Angle Sum Property of a Triangle.

So, (11x - 4) + (16x +40) = 90

11x + 16x + 40 - 4 = 90

27x + 36 = 90

27x = 90 - 36

27x = 54

x = 54/27

x = 2

Hence the value of x is given by, x = 2.

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The coin tosses are a random event, and as the sample size (12 tosses) is relatively small, there is a possibility for some variability in the proportions reported by the students.

a) The histogram to be approximately bell-shaped, with the majority of the data clustered around the center and gradually tapering off towards the edges. This is because the coin tosses are a random event, and as the sample size (12 tosses) is relatively small, there is a possibility for some variability in the proportions reported by the students. However, as the sample size is relatively large (there are many students in the class), the Law of Large Numbers suggests that the sample means should converge towards a normal distribution.

b) The histogram to be centered around 0.5, as the coin is fair and therefore there is an equal chance of getting heads or tails on each toss. This means that the expected proportion of heads is 0.5.

c)  There to be some variability among the proportions reported by the students, as each person's results are based on a random event. However, as the sample size is relatively large, I would expect the variability to be relatively small and for the sample means to converge towards a normal distribution.

d) A Normal model should not be used here because the distribution of the proportions reported by the students is likely to be skewed, as it is bounded by 0 and 1. Additionally, as the sample size is relatively small (12 tosses), the Central Limit Theorem does not necessarily apply, and the sample means may not converge towards a normal distribution. Instead, a binomial distribution may be more appropriate to model the distribution of the proportions reported by the students.

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The r-value ranges from -1 to +1, with -1 indicating a strong negative correlation. Therefore, the r-value closest to -1 represents the strongest negative correlation.

An r-value represents the strength and direction of a correlation between two variables. The strongest negative correlation occurs when the r-value is -1. In this case, as one variable increases, the other variable decreases consistently, showing a perfect negative linear relationship between the two variables.

The ability of a material to resist the flow of heat through it is gauged by the R-value , which is used in materials research and building construction. It measures the energy efficiency of insulation materials including fibreglass, foam board, and cellulose and is commonly represented in square metres kelvin per watt (m2K/W) units.

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8(a). To find the sample proportion, divide the number of adults with pinworm infestation (68) by the total number of adults in the sample (820).

Sample proportion (p) = 68 / 820 = 0.083

To find the critical value, we use a 98% confidence interval, which leaves 2% in the tails. Divide this by 2 to get 1% in each tail. Using a z-table, we find that the z-score corresponding to a 99% cumulative probability is 2.576.

Critical value (z) = 2.576

Next, we calculate the margin of error. The formula for margin of error is:

Margin of error = z * √(p * (1-p) / n)

Margin of error = 2.576 * √(0.083 * (1-0.083) / 820) ≈ 0.028

8(b). To construct the 98% confidence interval, add and subtract the margin of error from the sample proportion:

Lower limit = 0.083 - 0.028 = 0.055
Upper limit = 0.083 + 0.028 = 0.111

The 98% confidence interval is (0.055, 0.111).

8(c). We want to determine if we are 98% confident that more than 5% of all U.S. adults have pinworm. Since 0.05 is below the lower limit of the confidence interval (0.055), the correct answer is:

Yes, because 0.05 is below the lower limit of the confidence interval.

8(d). In Sludge County, the proportion of adults with pinworm is 0.12. We need to compare this to our confidence interval (0.055, 0.111). Since 0.12 is above the upper limit of the confidence interval, the correct answer is:

Yes, because 0.12 is above the upper limit of the confidence interval.

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The height at the 45th percentile is approximately 63.75 inches.

The height at the 45th percentile, we can use the z-score formula:

z = (x - μ) / σ

where:

x is the height we want to find

μ is the population mean, which is 64 inches

σ is the population standard deviation, which is 2.0 inches

z is the z-score corresponding to the 45th percentile, which we can find using a standard normal distribution table or calculator.

The z-score corresponding to the 45th percentile, we can use the inverse normal cumulative distribution function (also called the inverse Gaussian function) with a probability of 0.45:

z = invNorm(0.45) = -0.1257 (rounded to four decimal places)

Now we can solve for x:

z = (x - μ) / σ

-0.1257 = (x - 64) / 2.0

-0.1257 × 2.0 = x - 64

-0.2514 + 64 = x

x = 63.7486

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The locus of points in a plane that are equidistant from endpoints A and B is the perpendicular bisector of the line segment AB.

To see why this is true, consider a point P in the plane that is equidistant from A and B. This means that the distance from P to A is equal to the distance from P to B.

Now, draw the line segment AP and the line segment BP. Since the distance from P to A is equal to the distance from P to B, these two line segments must have the same length. Therefore, triangle APB is an isosceles triangle, and the perpendicular bisector of AB passes through the midpoint of AB and is perpendicular to AB.

Conversely, any point on the perpendicular bisector of AB is equidistant from A and B. Therefore, the perpendicular bisector of AB is the locus of points that are equidistant from A and B.

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The circular arcs of radius 5 units bound the region so the area, in square units, of the region is 50.

The simplest way to think about it is as follows. Assume we wish to define R as the entire region in the first quadrant above the graph y = x 2. S is now defined as the entire region below the graph of y = x. It is obvious that the region R S equals the area in the first quadrant below y = x minus the area under the curve y = x 2. Try to figure out why this is the case, and then click Continue.

Now that we know what kind of problem we're dealing with, we can start turning it to arithmetic, namely integrals. Take note that the region of interest goes between the two curve junctions.

The area of the semicircle is = [tex]\frac{1}{2} \pi 15^2[/tex]

= 25/2π

The area of the two quarter - circles is

= 2 x 1/4 x π x 25

= 25π/2

So, the area of the region is

= 25π/2 + 5x(5+5) - 25π/2

= 50

Therefore, area of square unit is 50.

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If boat is heading towards a lighthouse, whose beacon-light is 142 feet above the water, the distance from point A to point B is approximately 226.6 feet.

To find the distance from point A to point B, we can use the tangent function. Let x be the distance between point A and the lighthouse, and let y be the distance between point B and the lighthouse. We can then set up two equations based on the angles of elevation:

tan(13°) = 142/x

tan(20°) = 142/y

Solving for x and y, we get:

x = 142/tan(13°) ≈ 627.8 feet

y = 142/tan(20°) ≈ 401.2 feet

The distance between point A and point B is the difference between x and y:

x - y ≈ 226.6 feet

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Complete question is:

A boat is heading towards a lighthouse, whose beacon-light is 142 feet above the water. From point A, the boat’s crew measures the angle of elevation to the beacon, 13 degree, before they draw closer. They measure the angle of elevation a second time from point B at some later time to be 20 degrees . Find the distance from point A to point B. Round your answer to the nearest foot if necessary.

The p-value will be smaller if the sample proportions are far apart because a larger difference results in a larger absolute value of the numerator of the test statistic. A

The p-value measures the strength of the evidence against the null hypothesis.

A smaller p-value indicates stronger evidence against the null hypothesis, and a larger p-value indicates weaker evidence against the null hypothesis.

Comparing two sample proportions with a two-sided alternative hypothesis, all other factors being equal, the p-value will be smaller if the sample proportions are far apart.

This is because a larger difference between the sample proportions results in a larger absolute value of the numerator of the test statistic, which is used to calculate the p-value.

The numerator of the test statistic is the difference between the sample proportions, so a larger difference between the sample proportions will result in a larger absolute value of the numerator, which will result in a smaller p-value.

Option A correctly explains this by stating that a larger difference between the sample proportions results in a larger absolute value of the numerator of the test statistic, which results in a smaller p-value.

Option B is not correct, as a pooled proportion close to 0.5 actually results in a larger standard error, which would result in a larger p-value, not a smaller one.

Option C is not correct, as a smaller difference between the sample proportions would result in a larger p-value, not a smaller one.

Option D is also not correct, as a smaller standard error would result in a larger test statistic and a smaller p-value, but the standard error is not affected by the closeness of the sample proportions.

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(L2) A(n) inscribed circle is a circle that is contained within a polygon so that the circle intersects each side of the polygon at exactly one point.

An inscribed circle is also known as an incircle, and it is the largest circle that can be inscribed inside a polygon. In a polygon, if all sides are of equal length and all angles are of equal measure, then the inscribed circle will be a regular circle. The center of the inscribed circle is called the incenter, and it is the point of concurrency of the angle bisectors of the polygon. The incenter is equidistant from all sides of the polygon, and the radius of the inscribed circle is equal to the distance between the incenter and any side of the polygon.

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It will take 85.32 years for the population to reach the carrying capacity of 18 billion, assuming the growth rate as 2.1% and starting population as 3 billion.

We use the "exponential-growth" model to estimate how long it will take for the population to reach the carrying capacity of 18 billion. The exponential growth model is given by : P(t) = P₀[tex]e^{rt}[/tex],

where P(t) is = population at time "t", P₀ is = initial population, r is = annual growth rate (expressed as a decimal), and e ≈ 2.71,

We have,

P₀(initial population) = 3 billion

r( growth rate) = 0.021

We want to find the value of "t" when P(t) = 18 billion. So, we can write:
18 = 3[tex]e^{0.021t}[/tex],

6 = [tex]e^{0.021t}[/tex],

ln(6) = 0.021t

t = ln(6)/0.021

t ≈ 85.32 years,

Therefore, the time taken to reach the required population is 85 years.

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The given question is incomplete, the complete question is

Assuming the carrying capacity of the earth is 18 billion, the annual growth rate is 2.1%, and the current population is 3 billion, use the exponential growth model to estimate, How long it will take for the population to reach the carrying capacity.

The F statistic, we divide the mean square for treatments by the mean square for error, which gives us 9.86

What is the mean and standard deviation?

The standard deviation is a summary measure of the differences of each observation from the mean. If the differences themselves were added up, the positive would exactly balance the negative and so their sum would be zero. Consequently, the squares of the differences are added.

Using the information given,

To calculate the F statistic, we divide the mean square for treatments by the mean square for error, which gives us:

F = MS(T)/MS(E) = 2280/231.11 = 9.86

The degrees of freedom for treatments is 2 (since there are three methods and we lose one degree of freedom due to the constraint that the sum of the means of each method is equal to the overall mean), and the degrees of freedom for error is 27 (which is the total number of observations minus the total number of treatments).

Therefore, the ANOVA table for this problem is in the attached figure.

Hence, the F statistic, we divide the mean square for treatments by the mean square for error, which gives us 9.86

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Answer:

Y=13

Step-by-step explanation:

Answer: 78539.82

My explanation is listed bellow

V=πr2h=π·252·40≈78539.81634

The initial size of the bird population was approximately 4,619 birds, and the estimated population 2 years from now is approximately 6,528 birds.

We are dealing with a bird population that doubles every 10 years. To find the initial population 25 years ago, we can use the formula:

Initial population = Current population / (2^(Years since introduction / 10))

Here, the current population is 13,000, and it has been 25 years since the bird species was introduced. Plugging in these values, we get:

Initial population = 13,000 / (2^(25 / 10))

Initial population = 13,000 / (2^2.5)

Initial population ≈ 4,619 birds (rounded to the nearest whole number)

To estimate the bird population 2 years from now, we can use the same formula with a total of 27 years since the introduction:

Future population = Initial population * (2^(Years since introduction / 10))

Future population = 4,619 * (2^(27 / 10))

Future population ≈ 6,528 birds (rounded to the nearest whole number)

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The dimensions of the envelope are 6 inches and 8 inches.

Let's use the formula for the area of a rectangle to find the dimensions of the envelope. If we let l be the length and w be the width of the envelope, then we have:

Area = length * width = 48

Perimeter = 2 * (length + width) = 28

We can use the second equation to solve for one of the variables in terms of the other. For example, we can solve for length as:

length = (28 - 2 * width) / 2

Now we can substitute this expression for length into the first equation to get:

width * ((28 - 2 * width) / 2) = 48

Simplifying this equation, we get:

14w -[tex]w^{2}[/tex] = 48

Rearranging and factoring, we get:

[tex]w^{2}[/tex] - 14w + 48 = 0

(w - 6)(w - 8) = 0

So the possible values for the width are w = 6 or w = 8. If we plug these values into the equation we derived for the length, we get:

length = (28 - 2 * 6) / 2 = 8

or

length = (28 - 2 * 8) / 2 = 6

Therefore, the dimensions of the envelope are either 6 inches by 8 inches or 8 inches by 6 inches.

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The binary number 1011000 (base 2) is equivalent to 88 in base 10.

To find the base 10 decimal representation of the binary number 1011000 (base 2), we can use the formula:

[tex]1 * 2^6 + 0 * 2^5 + 1 * 2^4 + 1 * 2^3 + 0 * 2^2 + 0 * 2^1 + 0 * 2^0 = 88[/tex]

Therefore, the binary number 1011000 (base 2) is equivalent to 88 in base 10.

To understand how this conversion works, it is helpful to first understand what these two number systems represent.

Binary is a positional number system that uses two digits: 0 and 1. Each digit represents a different power of 2, with the rightmost digit representing 2^0, the next digit to the left representing 2^1, and so on. Therefore, the binary number 1011000 (base 2) can be interpreted as:

[tex]1 * 2^6 + 0 * 2^5 + 1 * 2^4 + 1 * 2^3 + 0 * 2^2 + 0 * 2^1 + 0 * 2^0[/tex]

To convert this binary number to base 10 (decimal), we simply evaluate this expression:

[tex]1 * 2^6 = 64[/tex]

[tex]0 * 2^5 = 0[/tex]

[tex]1 * 2^4 = 16[/tex]

[tex]1 * 2^3 = 8[/tex]

[tex]0 * 2^2 = 0[/tex]

[tex]0 * 2^1 = 0[/tex]

[tex]0 * 2^0 = 0[/tex]

Adding these values together, we get:

64 + 0 + 16 + 8 + 0 + 0 + 0 = 88

Therefore, the binary number 1011000 (base 2) is equivalent to 88 in base 10.

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To determine the three angles in a triangle, we can use the Law of Cosines or the Law of Sines. However, since we are not given any side lengths, we will use the dot product formula to find the angles between the sides.

Then, we can compute the magnitudes of these vectors using the Pythagorean theorem:

|AB| = sqrt((Bx - Ax)^2 + (By - Ay)^2)
|AC| = sqrt((Cx - Ax)^2 + (Cy - Ay)^2)
|BC| = sqrt((Cx - Bx)^2 + (Cy - By)^2)

where (Ax, Ay), (Bx, By), and (Cx, Cy) are the coordinates of points A, B, and C, respectively.

Finally, we can use the dot product formula above to compute the cosines of angles A, B, and C, and then take the inverse cosine to find the angles in radians:

A = acos((AB · AC) / (|AB| · |AC|))
B = acos((AB · BC) / (|AB| · |BC|))
C = acos((AC · BC) / (|AC| · |BC|))

where acos denotes the inverse cosine function.

Therefore, we can determine all three angles in the triangle (in radians) using the above formulae.
It seems that the three points of the triangle were not provided in your question. To help you determine the angles of the triangle, please provide the coordinates of the three points (A, B, and C).

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Answer:

the nearest of that is $484,500.00

Step-by-step explanation:

im not sure but im sorry if wrong

In the long run, the likelihood of indifferent weather in Columbus on a given day is approximately 29.3%.

To find the long-term likelihood of indifferent weather in Columbus, we need to find the steady-state probabilities of the stochastic matrix provided. The matrix is given as:

P = | 0.6  0.5  0.4 |
     | 0.3  0.2  0.3 |
     | 0.1  0.3  0.3 |

1. First, find the transpose of the matrix P:
P^T = | 0.6  0.3  0.1 |
          | 0.5  0.2  0.3 |
          | 0.4  0.3  0.3 |

2. Next, subtract the identity matrix I from the transpose of P:
P^T - I = | -0.4  0.3  0.1 |
               |  0.5 -0.8  0.3 |
               |  0.4  0.3 -0.7 |

3. To find the steady-state probabilities, we need to solve the system of linear equations:
(-0.4)x + 0.3y + 0.1z = 0
0.5x - 0.8y + 0.3z = 0

We also have an additional constraint since the sum of probabilities must equal 1:
x + y + z = 1

4. Solve this system of linear equations using any method (substitution, elimination, or matrix method). The resulting probabilities are:
x = 0.432 (good weather probability)
y = 0.293 (indifferent weather probability)
z = 0.275 (bad weather probability)

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Based on the information given in your question, where the expectation of the square of the maximum eigenvalue is at most Nσ², we can deduce that the expression should have the form:

E[(λ_max(A))²] ≤ Nσ²

A matrix is a rectangular array made up of numbers, equations, or symbols. With an order of number of rows x number of columns, this arrangement is made up of horizontal rows and vertical columns.

Let's consider the random matrix A with iid entries and variance σ². We denote its maximum eigenvalue as λ_max(A).

To establish an upper bound on the expectation of the square of the maximum eigenvalue, we'll use the result from random matrix theory known as Marchenko-Pastur law.

According to the Marchenko-Pastur law, for a random matrix A with iid entries, as the size of the matrix becomes large (N → ∞), the distribution of eigenvalues follows a Marchenko-Pastur distribution. This distribution depends on the aspect ratio, q = p/N, where p represents the number of columns in the matrix A.

The Marchenko-Pastur distribution has a probability density function given by:

f(λ) = (1/(2πσ²qλ)) * √((λ_max - λ)(λ - λ_min))

where λ_min and λ_max are the minimum and maximum eigenvalues supported by the distribution, which can be calculated as:

λ_min = (1 - √(q))²σ²

λ_max = (1 + √(q))²σ²

Now, let's calculate the expectation of the square of the maximum eigenvalue:

E[(λ_max(A))²] = ∫[λ_min, λ_max] λ² * f(λ) dλ

Substituting the expression for f(λ), we get:

E[(λ_max(A))²] = ∫[λ_min, λ_max] λ² * (1/(2πσ²qλ)) * √((λ_max - λ)(λ - λ_min)) dλ

After simplification, we find:

E[(λ_max(A))²] = (1/(2πσ²q)) ∫[λ_min, λ_max] √((λ_max - λ)(λ - λ_min)) dλ

The integral on the right-hand side can be computed analytically using standard techniques. However, the exact form of the expectation will depend on the specific values of q and σ².

Based on the information given in your question, where the expectation of the square of the maximum eigenvalue is at most Nσ², we can deduce that the expression should have the form:

E[(λ_max(A))²] ≤ Nσ²

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Rounding up to the nearest whole number, the sample size used to conduct this confidence interval is roughly 385. So, the sample size used to conduct this 95% confidence interval is roughly 340 students.

To find the sample size that was used to conduct this confidence interval, we need to use the formula:

n = (Z^2 * p * q) / E^2

where:

n = sample size
Z = the z-score associated with the confidence level (in this case, 1.96 for a 95% confidence interval)
p = the proportion of first-year students who played in intramural sports (0.35 in this case)
q = 1 - p (the proportion who did not play in intramural sports)
E = the margin of error (0.05 in this case)

Plugging in the values we have:

n = (1.96^2 * 0.35 * 0.65) / 0.05^2
n = 384.16

Rounding up to the nearest whole number, the sample size used to conduct this confidence interval is roughly 385.

Based on the given 95% confidence interval for the proportion of first-year students who played intramural sports, we can estimate the sample size used. The conservative interval is 35% ± 5%, which means the proportion ranges from 30% to 40%.

To calculate the sample size, we can use the following formula:

n = (Z^2 * p * (1-p)) / E^2

Where:
n = sample size
Z = Z-score for a 95% confidence level (1.96)
p = proportion (0.35)
E = margin of error (0.05)

n = (1.96^2 * 0.35 * (1-0.35)) / 0.05^2
n ≈ 340

So, the sample size used to conduct this 95% confidence interval is roughly 340 students.

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Required value of Mean Square Error is 8.33.

To calculate the Mean Square Error (MS Error) for a study comparing grade point averages (GPA) for students in a class, divided by 6 locations where they usually sat during the lecture.

The Error Sum of Squares (SS Error) is 50, and the total sample size is 12 students. To calculate the MS Error, follow these steps:

1. Determine the degrees of freedom for the error (df Error).

We know,

the total sample size minus the number of groups: df Error = (total sample size) - (number of groups) df Error

= 12 - 6

= 6

2. Calculate the MS Error using the SS Error and df Error:

MS Error = SS Error / df Error MS Error

= 50 / 6 3.

So, MS Error ≈ 8.33

Therefore, The Mean Square Error (MS Error) for the study comparing GPAs for students in a class divided by 6 locations is approximately 8.33.

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The joint density function of x and y is f(x,y) = 1 for 0 <= x <= 1 and 0 <= y <= 1.

The joint density function of two random variables x and y is a function that assigns a non-negative value to every possible pair of x and y values. In this case, since x and y are independent and identically distributed uniform random variables on [0,1], their joint density function is given by the product of their individual density functions:

f(x,y) = f(x) × f(y) = 1 × 1 = 1, 0 <= x <= 1, 0 <= y <= 1

So the joint density function of x and y is f(x,y) = 1 for 0 <= x <= 1 and 0 <= y <= 1.

Since x and y are independent and identically distributed uniform random variables on [0,1], their probability density functions (PDFs) are given by:

f(x) = 1, 0 <= x <= 1

f(y) = 1, 0 <= y <= 1

The joint probability density function (PDF) of x and y is given by the product of their individual PDFs:

f(x,y) = f(x) × f(y) = 1 × 1 = 1, 0 <= x <= 1, 0 <= y <= 1

Therefore, the joint density function of x and y is f(x,y) = 1 for 0 <= x <= 1 and 0 <= y <= 1.

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Answer:

28.27

Step-by-step explanation:

A=πr2=π·32≈28.27433mi²

have a good day God bless :)

Interval estimation refers to the use of sample data to calculate a range of values that is believed to include the value of the population parameter.

Interval estimation in statistics is the calculation of the interval or set of values in which the parameter is. For example, the mean (mean) of the population is most likely to be located. The confidence coefficient is calculated by choosing intervals in which the parameter falls with a probability of 95 or 99 percent. Consequently, the intervals are referred to as confidence interval estimates. The formula for estimating an interval is, [tex] \mu = \bar x ± Z_{ \frac{\alpha}{2}}(\frac{\sigma}{\sqrt{n}})[/tex]

Where, the confidence coefficient

The purpose of the interval estimate is to quantify the precision of the point estimate. So the desired answer is an interval estimate.

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at the 5% level of significance, we can conclude that the population median score for the students taking the writing portion of the SAT is not 500.

We can use the Wilcoxon rank-sum test (Mann-Whitney U test) to test the hypothesis that the population median score for the students taking the writing portion of the SAT is 500.

Null Hypothesis: The population median score for the students taking the writing portion of the SAT is 500.

Alternative Hypothesis: The population median score for the students taking the writing portion of the SAT is not 500.

We can use the Wilcoxon rank-sum test because the sample size is small, and the population distribution is not known. The Wilcoxon rank-sum test does not require the normality assumption.

Using the given data, we rank the scores, and then calculate the test statistic U as follows:

Rank: 13 14 2 3 4 6 1 5 7 8 3 11 0 0 9

Sample size (n) = 15

Sum of ranks for students with scores >= 500 (R1) = 61

Sum of ranks for students with scores < 500 (R2) = 54

U = min(R1, R2) = 54

Using Table 1 of Appendix B for alpha = 0.05 and n1 = n2 = 15, the critical value of U is 19.

Since U = 54 is greater than the critical value of 19, we reject the null hypothesis and conclude that there is evidence that the population median score for the students taking the writing portion of the SAT is not 500.

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Answer:

[tex]-6\leq x < 5[/tex]

Step-by-step explanation:

Given compound inequality:

[tex]31 \geq-4x+7\;\;\;\textsf{and}\;\;\;-4x+7 > -13[/tex]

Solve the first inequality:

[tex]\begin{aligned}31 & \geq -4x+7\\\\31 +4x& \geq -4x+7+4x\\\\4x+31& \geq 7\\\\4x+31-31 & \geq 7-31\\\\4x & \geq -24\\\\\dfrac{4x}{4} & \geq \dfrac{-24}{4}\\\\x & \geq -6\end{aligned}[/tex]

Solve the second inequality:

[tex]\begin{aligned}-4x+7& > -13\\\\-4x+7-7& > -13-7\\\\-4x& > -20\\\\\dfrac{-4x}{-4}& > \dfrac{-20}{-4}\\\\x& < 5\end{aligned}[/tex]

Therefore, combining the solutions, the solution to the compound inequality is:

[tex]\large\boxed{-6\leq x < 5}[/tex]

When graphing inequalities:

To graph the solution: