ap exam a small class of five statistics students received the following scores on their ap exam: 5, 4, 4, 3, 1. a) calculate the mean and standard deviation of these five scores.

Answer:

MMXV

Step-by-step explanation:

(⁠◕⁠ᴗ⁠◕⁠✿⁠)(⁠◕⁠ᴗ⁠◕⁠✿⁠)(⁠◕⁠ᴗ⁠◕⁠✿⁠)

if there are 5 people and 2 have to sit next to each other and 2 others cant sit next to each other, then 30 combinations possible

What are combinations?

A combination is a calculation that determines the number of possible arrangements in a collection of items in which the order of the selection does not matter. In combinations we can select the items in any order.

nn!/r!(n-r)!

Number of ways=5

=5!/2!2!

=5!/2*2

=5*4*3*2/2*2

=30

=30 ways

if there are 5 people and 2 have to sit next to each other and 2 others cant sit next to each other, then 30 combinations possible

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Answer:

2x, 2x + 2

Step-by-step explanation:

2x is even

2x + 2 = 2(x+1)

x and x+1 are consecutive integers

So multiplying both by 2 makes  them consecutive even integers

For example with x = 1

2x = 2, 2(x+1) = 2 . 2 = 4 which is next even consecutive integer

Answer:

2x, 2x + 2

Step-by-step explanation:

Each expression is divisible by 2, so it is even.

In multiple regression,

Thus, option (a), (b), and (d) is correct.

The F-test is done to check for the equality of variances for the samples given whereas the F-distribution is a positively skewed distribution involving the numerator and the denominators degrees of freedom

a. The F statistic is only appropriate if errors are homoskedastic.

b. The F statistic can never be negative.

c. The F statistic has approximately a normal distribution in large samples.

d. The F statistic has approximately an X² distribution in large samples

In the given question, parts (a), (b), and (d) are true.

As the F-distribution is always positively skewed and is the ratio of the mean squares of between and within errors, it can never be negative and the assumptions of the samples having equal variances need to be fulfilled before proceeding with the test

Hence, in multiple regression,

a. The F statistic is only appropriate if errors are homoskedastic.

b. The F statistic can never be negative.

d. The F statistic has approximately an X² distribution in large samples

option (a), (b), and (d) is correct.

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Full question:

Which of the following is true about the F statistic in the multiple regression model? (Select all that apply.)

a. The F statistic is only appropriate if errors are homoskedastic.

b. The F statistic can never be negative.

c. The F statistic has approximately a normal distribution in large samples.

d. The F statistic has approximately a χ² distribution in large samples.

Using the ratio, if a certain piece of brass requires 10kg of zinc, the weight of the copper required for the same piece is 15 kg.

A ratio expresses the frequency with which one number contains another. If a fruit dish contains eight oranges and six lemons, the orange-to-lemon ratio is eight to six. Similarly, the orange to lemon ratio is 6:8, while the orange to total fruit ratio is 8:14.

Here,

Given that a company uses copper and zinc in a weight-to-weight ratio of 3:2 to make bronze. As a result, the metal ratio can be written as,

3/2 = copper/zinc

Now, because the zinc weighs 10 kilograms.

As a result, the ratio can be depicted as,

3/2 = copper / zinc

3/2 = copper / 10kg

3 x 10 /2 =copper

30/2 = copper

15 = copper

As a result, if 10kg of zinc is required for a specific piece of bronze, the weight of copper required for the same piece is 15kilograms.

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Answer:

x=5/3 0r 1 2/3

Answer:4x+3

Step-by-step explanation:

Given the following in the question if:

Volume of the box= 4x3+19x2+12z

Height of the box= x

width of the box =?

we have to find the width of the box, so as we know that

box is in the shape of cuboid, so

Volume of the cuboid = length * width * height

4x3+9x2+12x   =   x+4* width * x

width = 4x3+9x2+2x/x2+4x

we have to use long division method for this algebraic expression to divide and find width of the box.

we get width= 4x+3

Hence, the width of the box which in the shape of cuboid is 4x+3

A stationary point can be found by solving d y d x = 0 , i.e. finding the x coordinate where the gradient is 0.

When the derivative of a function, f(x), equals 0, it is said to be stationary. Because the function is neither increasing nor decreasing at these locations, they are referred to be "stationary" points.

This graphically correlates to locations on the graph of f(x) where the horizontal line that forms the tangent to the curve is present.When the derivative of a function, f(x), equals 0, it is said to be stationary. Because the function is neither increasing nor decreasing at these locations, they are referred to be "stationary" points.

Stationary Points Defined. Remember that a stationary point is a value of x0 for x at which f′(x0)=0 f ′ (x 0) = 0 for a univariate function y=f(x) y = f (x).

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If a machine closes 35 packages per minute. The number of packages the machine can close in 40 minutes is: 1400 packages.

Using this formula to  find the number of packages

Number of packages = Packages per minute machine closes ×   Number of minutes

Let plug in the formula

Number of packages =  35 packages per minute × 40 minutes

Number of packages =  1400 packages

Therefore we can conclude that the number of packages is 1400 packages.

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The complete question is:

A machine closes 35 packages per minute How many packages can the machine close in 40 minutes? Enter your answer in the box. packages?

Answer:

(-1,-1)

Step-by-step explanation:

join the mid points of AB, BC & AC ...

you got the orthocenter point, then we can read the coordinates from X-axis and Y-axis.

The 99% confidence interval for population proportion p is 0.117 < P < 0.243 for the true population proportion of people who received flu vaccinations this year when out of 200 people sampled, 36 received flu vaccinations this year.

Given that,

n = 200

x = 36

Point estimate = sample proportion

= x/n = 36/200 = 0.18

1 - p = 1 - 0.18 = 0.82

At a 99% level, the z is,

α = 1 - 0.99 = 0.01

α/2 = 0.005

Zα/2 = 0.005Z = 2.576

The margin of error = E = Zα/2 [tex]\sqrt{p(1-p)} /n[/tex]

= 2.576[tex]\sqrt{0.18*0.82} /200[/tex]

E = 0.063

A 99% confidence interval for population proportion p is,

p - E < P < p + E

0.18 - 0.063 < P < 0.18 + 0.063

0.117 < P < 0.243

Therefore, the 99% confidence interval for population proportion p is 0.117 < P < 0.243 for the true population proportion of people who received flu vaccinations this year when out of 200 people sampled, 36 received flu vaccinations this year.

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The center of the circle is (3 , -2) and the radius is 4 then the equation of circle is (x)² + (y)²-6x+4y = 3

What is a circle?

The circle is defined as the locus of the point traces around a fixed point called as the center and is equidistant from the outer trace.

All points in a plane that are at a specific distance from a specific point, the center, form a circle. In other words, it is the curve that a moving point in a plane draws to keep its distance from a specific point constant.

The equation of the circle is,

( x - h )² + ( y - k )² = r²

(x-3)² + (y+2)² = 16

(x)² + (y)²-6x+9 +4y+4 = 16

(x)² + (y)²-6x+4y = 3

Compare the equations and find the center and radius,

Center = ( h,k) = ( 3, -2)

Radius = r = 4

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C. Unique solution. The system of linear equations have a unique solution because the equations are consistent and have the same number of variables and equations.

The given system of linear equations is x+2y=3 and 2x+4y=15. To determine whether the system of linear equations have no solution, infinitely many solution or unique solutions, we need to solve the system of equations. Firstly, we expand and simplify both equations to get x+2y=3 and 2x+4y=15. Then, we compare the coefficients of the equations to determine if the system of equations is consistent, inconsistent or dependent. Since the equations are consistent and have the same number of variables and equations, we can solve the system of equations. By isolating the variables and using the substitution method, we can solve the system of equations to get x=3 and y=3. This means that the system of linear equations have a unique solution.

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Square ABCD has a diagonal AC with the given vertices. Find the coordinates of the remaining vertices. A(2, 2) and C(6, - 2)

The coordinates are B(4,-2,) and (4,0)

Coordinates are two numbers (Cartesian coordinates), or sometimes a letter and a number, that locate a specific point on a grid, known as a coordinate plane. A coordinate plane has four quadrants and two axes: the x axis (horizontal) and y axis (vertical). (One way of helping children to remember which of these is which is to tell them that the x axis goes across because ‘x’ is a cross.)

The Cartesian Coordinate System is the name of the two-dimensional plane that is used in math to calculate points using a set of perpendicular lines and basing the points on the place where the line meet. The plane is called a Cartesian plane and Perpendicular lines are lines that intersect at exactly 90 degrees, which makes a right angle.

If A(2,2) and C(6,-2) are the coordinates of two opposite vertices of the square, then the square is a rectangle with a diagonal AC. The remaining vertices of the square can be determined by using the fact that opposite sides of a square are parallel and congruent.

If A(2,2) is one vertex of the square, then the vertex opposite it is C(6,-2)

If C(6,-2) is one vertex of the square, then the vertex opposite it is A(2,2)

The vertex B(x,y) can be found by moving 2 units left from C(6,-2)

x = 6 - 2 = 4

y = -2

so B(4,-2)

The vertex D(x,y) can be found by moving 2 units up from B(4,-2)

x = 4

y = -2+ 2 = 0

so D(4,0)

Therefore, the coordinates of the remaining vertices of the square are B(4,-2) and D(4,0)

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Sampling variation will have more impact on confidence interval but it is not accounted for by the margin of error.

What is Sampling variation?

The term "sampling variance" describes how much a sample estimate (a statistic) is likely to fluctuate from sample to sample due to the unique nature of each sample.

Sample Sizes and Variability are the factors which lead to sampling variation. As and when the sample size is changed i.e. either increased or decreased, the variability of samples fluctuates.

Since, Sam runs a large chain of car repair shops, this means he has large number of employees.

But his sample size is only of 10 employees whom he asks about their billable hours from which he constructs a 95% confidence interval for the true mean number of billable hours for all employees in the company.

Since, sampling variation is greatly affected by the sample size and variability, therefore it will have more impact on confidence interval.

Hence, sampling variation will have more impact on confidence interval but it is not accounted for by the margin of error.

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Since the options are missing in the question, here are the options from which answer is to be chosen

The probability of drawing the same color lollipop twice is 0.72.

According to the given question, 3 lollipops were picked up one by one, but after every draw, the lollipop is kept back in the jar. So it is a case of sampling with replacement.

Thereby, there will be 6 cases when the same color i.e red & yellow lollipops will be picked up 2 times i.e, rry, ryr, yrr, yry, yyr, ryy

(where r & y stand for red and yellow lollipops respectively)

And the corresponding probabilities for these six situations will be

(i) 3/5∗3/5∗2/5=18/125

(ii) 3/5∗2/5∗3/5=18/125

(iii)  2/5∗3/5∗3/5=18/125

(iv)  2/5∗3/5∗2/5=12/125

(v)  2/5∗2/5∗3/5=12/125

(vi)  3/5∗2/5∗2/5=12/125

Hence, the required probability will be the sum of all these probabilities i.e,

(i)+(ii)+(iii)+(iv)+(v)+(vi)

=3∗(18/125)+3∗(12/125)

=90/125

so, the probability that the same color Lollipop will be drawn two times is 90/125 or 0.72.

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The distance between Dallas, Texas and Omaha, Nebraska is 631.4 miles.

The distance between Dallas, Texas and Omaha, Nebraska can be calculated using the Haversine Formula. This formula calculates the great circle distance between two points on a sphere, taking into account the curvature of the Earth. The formula is as follows:

d = 2r arcsin( sqrt[ sin^2((lat2 - lat1)/2) + cos(lat1)cos(lat2)sin^2((lon2 - lon1)/2)] )

In this case, the latitude of Dallas, Texas is 32° 47' 39'' N and the latitude of Omaha, Nebraska is 41° 15' 50'' N. Since the two cities are on the same longitude, we can assume that the longitude for both cities is 0°.

Plugging these values into the formula, we get:

d = 2(4000 miles) arcsin[ sqrt[ sin^2((41° 15' 50'' N - 32° 47' 39'' N)/2) + cos(32° 47' 39'' N)cos(41° 15' 50'' N)sin^2((0° - 0°)/2)] ]

d = 631.4 miles

Therefore, the distance between Dallas, Texas and Omaha, Nebraska is 631.4 miles.

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Answer:

Gold is in Box 1

Step-by-step explanation:

There are 3 boxes. One of them contains gold

In each box, there is a message, and one of them is true.

Box 1: "The gold is not in Box 2".

Box 2: "The gold is in this box"

Box 3: "The gold is not in this box".

Which box has the gold?

Answer:

O Box 1

O Box 3

O Box 2

There's not enough info

Assume each statement to be true at a time, and check for contradictions.

Box 1: "The gold is not in Box 2".

Assume True. Gold in 1 or 2.

Box 2: "The gold is in this box"

False. Gold not in 2.

Box 3: "The gold is not in this box".

False. Gold in 3

Contradiction between box1 and box 3 message.

Box 2: "The gold is in this box"

Assume true. Gold in 2.

Box 1: "The gold is not in Box 2".

False. Gold in 2.

Box 3: "The gold is not in this box".

False. Gold in 3.

Contradiction between boxes 2 and 3. Box 2 message cannot be true.

Box 3: "The gold is not in this box".

Assume true. Gold in 1 or 2.

Box 1: "The gold is not in Box 2".

False. Gold in 2.

Box 2: "The gold is in this box"

False. Gold not in 2.

No contradictions.

Gold must be in 1.

Answer: Gold is in Box 1

C) 1/2 is the value of P(A)

Independent events are events in probability and statistics that have no effect on each other and are not related to each other in any way, so the outcome of one event does not affect the outcome of the other event.

let the value of P(A) be x and the value of P(B) be y  given A and B are independent events

so P(A∩B) = P(A) * P(B)

=> x*y=1/6 ---(i)

now P(⁻A) = 1 - P(A) , P(B) = 1 - P(⁻B)

so P( ⁻A  ∩ ⁻B ) = (1-x)*(1-y)

=> 1 -x - y +xy = 1/3

=> x +y  =1+1/6-1/3

=> x + y = 5/6  ----(ii)

x - y = √(x+y)²-4xy

=> √(5/6)² - 4*1/6

=> √25/36 - 4/6

=> √(25-24)/36

=> √1/36

=> 1/6

so x-y = 1/6 ---(iii)

adding equation (ii) and (iii) we get

2x = 1

=> x = 1/2

so P(A)  = 1/2

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Complete question :

If A and B are independent events of random experiment such that P(A∩B)=1/6 and P( ⁻A  ∩ ⁻B )=1/3, then P(A)=?

a. 1/4b. 1/5c. 1/2s. 2/3

Step-by-step explanation:

To calculate how much should be placed in an account now to have $21,200 cash for a new car 7 years from now, we can use the formula for compound interest:

A = P(1 + r/n)^(nt)

Where:

A = future value (amount of money after t years)

P = present value (amount of money now)

r = annual interest rate (as a decimal)

n = number of times the interest is compounded per year

t = number of years

In this case, we have:

A = $21,200

r = 0.064 (6.4% as a decimal)

t = 7

n = 1 (the interest is compounded annually)

So, we can solve for P:

P = A / (1 + r/n)^(nt)

P = $21,200 / (1 + 0.064)^(7)

P = $15,093.35

Therefore, the person should place $15,093.35 in an account now to have $21,200 cash for a new car 7 years from now, at an annual interest rate of 6.4%.

Answer:

1818886278282871728282882

Willa's debt to income ratio is 34%.

Debt to income ratio is usually calculated as a percentage of the gross monthly debt payments divided by the gross monthly income.

Given that,

Willa earns a bi-weekly gross income of $2,417.00

Monthly gross income = 2 × $2,417.00 = $4834

Monthly debt payments = $1,623.00

Debt to income ratio = $1,623.00 / $4834.00

                                   = 0.3357

                                   = 33.57%

                                   = 34%

Hence the debt to income ratio of Willa is 34%.

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Answer:

The transaction amount for 3: -155.15

The transaction amount for 4: -223.75

Step-by-step explanation:

Answer:

  I1 ≈ 103.6∠68.7° mA

  I2 ≈ 163.7∠50.3° mA

Step-by-step explanation:

Given equations for mesh currents, you want to find their values in polar form.

The coefficients of these equations can be used to fill an augmented matrix, which can then be reduced by a suitable calculator to give the values of the variables.

  I1 = (14+j36)/373 ≈ 0.1036∠68.7°

  I2 = (39+j47)/373 ≈ 0.1637∠50.3°

__

Additional comment

The equations can be solved "by hand" using any of the usual methods: substitution, elimination, Cramer's Rule, and others. The complex arithmetic makes it tedious, but not significantly more difficult. A suitable calculator reduces the work substantially.

The second attachment shows more working using the "cross multiplication method", similar to Cramer's Rule.

The decision between one sided and two sided alternative hypothesis is based on the statement of the null hypothesis and the alternative hypothesis appropriate for the context of the problem.

The hypothesis test is used to check if the observed data is consistent with the expected data or not. To do this, a null hypothesis and an alternative hypothesis are formulated. The decision between one sided and two sided alternative hypothesis is based on the statement of the null hypothesis and the alternative hypothesis appropriate for the context of the problem. The one-sided alternative hypothesis is used when the researcher is mainly interested in testing whether the population mean is either greater than or less than a given value. On the other hand, the two-sided alternative hypothesis is used when the researcher is mainly interested in testing whether the population mean is either different from or not different from a given value. The level of significance chosen for the test should be determined before the decision is made between one sided and two sided alternatives.

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The point (-5,3) is in the same quadrant as the fourth vertex of the square.

The given points are representing the points in the quadrant of the cartesian coordinate system. According to this any location on a 2-D plane is represented by 2 numbers, x and y, where x represents the horizontal displacement from the origin of the plane and y represents the vertical displacement from the origin.

Since the given points are the vertices of a square they must be in the form (c, d), (c, -d), (-c, -d), and (-c,d). So, from the given points only the B (-5,3) satisfies the given condition and forms the square.

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A. The unit cost of the product follows a normal distribution with an expected value of ETB 305 and a standard deviation of ETB 5.

B. The expected value of the unit cost of the product is ETB 305 and the variance is ETB 25.

In order to calculate the standard deviation, follow the following steps:

1. Calculate the mean (average) of your data set.

2. For each data point, subtract the mean and square the result (the squared difference).

3. Sum all of the squared differences.

4. Divide the sum by the number of data points. This gives you the variance.

5. Take the square root of the variance to get the standard deviation.

Therefore, the correct answer is as given above

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Answer: x= -1

Step-by-step explanation:

9x-3(x-5)=6x+3

9x-3x+15=6x+3

9x+6x-3x= 3-15

    15x-3x= -12

         12x= -12

            x= -1

Answer: sorry would help ya but i can't because i have no clue what the question is asking me to round...