Independent Gaussian random variables X ~ N(0,1) and W~ N(0,1) are used to generate column vector (Y,Z) according to Y = 2X +3W, Z=-3X + 2W (a) Calculate the covariance matrix of column vector (Y,Z). (b) Find the joint pdf of (Y,Z). (C) Calculate the coefficient of the linear minimum mean square error estima- tor for estimating Y based on Z.

Answers

Answer 1

The covariance matrix of the column vector (Y, Z) is[[4Var(X) + 9Var(W), -6Var(X) + 6Var(W)][-6Var(X) + 6Var(W), 9Var(X) + 4Var(W)]].

Given that X and W are independent Gaussian random variables, where X ~ N(0,1) and W~ N(0,1) and Y = 2X + 3W and Z = -3X + 2W.

To calculate the covariance matrix of column vector (Y,Z), we need to follow the below steps.

Find the covariance between Y and Y.

Y = 2X + 3W and cov(Y,Y) = cov(2X+3W, 2X+3W)= 2² * Var(X) + 2*3*cov(X,W) + 3² * Var(W)        

= 4 * Var(X) + 18 * cov(X,W) + 9 * Var(W)

As X and W are independent, cov(X,W) = 0cov(Y,Y) = 4Var(X) + 9Var(W) ……………….(1)

Find the covariance between Z and Z.Z

= -3X + 2W and cov(Z,Z) = cov(-3X+2W, -3X+2W)

= (-3)² * Var(X) + (-3)*2*cov(X,W) + 2² * Var(W)        

= 9 * Var(X) + 4 * Var(W)

As X and W are independent, cov(X,W) = 0cov(Z,Z) = 9Var(X) + 4Var(W) ……………….(2)

Find the covariance between Y and Z.cov(Y,Z)

= cov(2X+3W, -3X+2W)= 2*(-3)*cov(X,X) + 2*3*cov(X,W) + 3*2*cov(W,X) + 3*2*cov(W,W)  

 = -6*Var(X) + 18*cov(X,W) + 6*cov(W,X) + 6*Var(W)

As X and W are independent, cov(X,W) = 0 and cov(W,X) = 0cov(Y,Z) = -6Var(X) + 6Var(W) ……………….(3)

The covariance matrix of the column vector (Y, Z) can be written as:

[[cov(Y,Y), cov(Y,Z)][cov(Z,Y), cov(Z,Z)]]

Substituting the values from equations (1), (2) and (3), we get:

Covariance matrix =[[4Var(X) + 9Var(W), -6Var(X) + 6Var(W)][-6Var(X) + 6Var(W), 9Var(X) + 4Var(W)]]

Therefore, the covariance matrix of the column vector (Y, Z) is[[4Var(X) + 9Var(W), -6Var(X) + 6Var(W)][-6Var(X) + 6Var(W), 9Var(X) + 4Var(W)]] where X ~ N(0,1) and W~ N(0,1) are independent Gaussian random variables.

#SPJ11

Let us know more about covariance matrix : https://brainly.com/question/30697803.


Related Questions

Write the ratio of 8 apples to 4 oranges in 3 different ways.
Then, write the ratio in the simplest form.

Answers

8 : 4
16 : 8
4 : 2

Simplest:
2 : 1

Answer:

Step-by-step explanation:

The three ways to write a ratio is:

8/4

8 to 4

8:4

The ratio in simpliest form is 2/1

You would divide each "side" by 4

Please somebody help me ASAP

Answers

it's recorded that out of 1000 people, 762 wear the corrective lenses.

just divide 762 from 1000 and multiply that result by 100.

762/ 1000 = .762

.762 x 100 = ? %

which is 76.2 %

so, we predict that 76.2% of Americans would wear corrective lenses.

Answer: 76.2 %

Which pairs of polygons are congruent? A. pairs 1, 2, 3, and 4 B. pairs 1 and 4 C. pairs 1, 2, and 3 D. pairs 2 and 4

Answers

D. Pair 2 and 4

Pair 2 are the same size and shape
Pair 4 are same size and shape
Pair 1 is different size different shape
Pair 3 is different size same shape

The diameter of this circle is 12 inches. The diameter of the smaller circle is 8 inches. find the area of the SHADED region.

Answers

Answer:

so you multiply 12 by 8 =96

Answer:

area of large circle=pi×r²

area of large circle =3.14×12²

area of large circle=452.16in²

area of small circle=pi×r²

area of small circle=3.14×8²

area pf small circle=200.96in²

area of shaded circle=452.16in²- 200.96in²

area of shaded circle =251.2in²

PLEASE HELP ME ANSWER THIS QUICKLY AND CORRECTLY WITH EXPLANATION! I WILL MARK YOUR BRAINLIST IF ONLY YOUR ANSWER IS CORRECT.

Answers

A.) Similar?  YES  

Why or why not?  It is similar because as your can see in the picture above, it shows a large triangle and a small triangle. On the smaller triangle, the corner "G" has a degree of 67. On the larger triangle, the corner "P" has the same degree as the smaller one, therefore all the other corners have the same degree making the missing degree for "R" 34 degrees, and the missing "C" 79 degrees.  

If so, *similarity statement and scale factor: SF:  1.5  

*I didn't know what they meant by similarity statement

B.) Similar?  NO  

Why or why not?  The triangles are two totally different shapes, with totally different degree angles, making it totally different  

If so, *similarity statement and scale factor: SF:  2  

*I didn't know what they meant by similarity statement

C.) Similar?  NO  

Why or why not?  The triangles are two totally different shapes, with totally different degree angles, making it totally different  

If so, *similarity statement and scale factor: SF:  1.2  

*I didn't know what they meant by similarity statement

D.) Similar?  YES  

Why or why not?  They are the same shape; just with one enlarged and one decreased in size. They both have the same angle degree and everything else similar but the size of the shape.  

If so, *similarity statement and scale factor: SF:  2  

*I didn't know what they meant by similarity statement

**To find the scale factor you would have to divide the big number, to the smaller number... Like for figure D, the base of the BIG triangle is 56, and the small triangle is 28. 56 ÷ 28 = 2 Making 2 the SF (Scale Factor)

Jon increased his trading card collection by 5 cards. He originally had 45 cards. What's the percent increase

Answers

Answer:

About 11%

Step-by-step explanation:

45 divided by 5 = 9

100 divided by 9 = 11.11111 (It goes on forever)

In order to determine an interval for the mean of a population with unknown standard deviation a sample of 61 items is selected. The mean of the sample is determined to be 23. The number of degrees of freedom for reading the t value is

a. 22

b. 23

c. 60

d. 61

Answers

Answer:

c. 60

Step-by-step explanation:

Given

[tex]n = 61[/tex] --- sample

[tex]\bar x = 23[/tex]

Required

Determine the degrees of freedom (df)

This is calculated as:

[tex]df = n - 1[/tex]

[tex]df = 61 - 1[/tex]

[tex]df = 60[/tex]

The formula is V=BH Base= 1/2BH Solve ---

Answers

Answer:

V = 36 cm³

Step-by-step explanation:

V = 1/2(3)(4)(6) = 36 cm³

how many outfits could you make if you had 6 pants,7 shirts,and 4 pairs of shoes to choose from?
A. 66
B. 12376
C. 17
D. 168

Answers

Answer:

D

Step-by-step explanation:

6x7x4= 168

A sample of 16 values is taken from a normal distribution with mean µ. The sample mean is 13.25 and true variance 2 is 0.81. Calculate a 99% confidence interval for µ and explain the interpretation of the interval.

Answers

we are 99% confident that the true value of µ lies within the interval (12.5831, 13.9169).

We have a random sample from a normal distribution with mean µ and a true variance of 0.81.

From this sample of 16 values, the sample mean was 13.25.

We want to calculate the 99% confidence interval for µ.

We can use the t-distribution to calculate the confidence interval since the sample size is less than 30.

We need to find the t-value that corresponds to a 99% confidence interval and 15 degrees of freedom (n-1).

We can use a t-distribution table or calculator to find that the t-value is 2.9477.

Using this value, we can calculate the confidence interval as follows: Lower bound = sample mean - (t-value * standard error)Upper bound = sample mean + (t-value * standard error) The standard error is the standard deviation divided by the square root of the sample size.

So, in this case: Standard error = √(0.81/16) = 0.2025 Lower bound = 13.25 - (2.9477 * 0.2025) = 12.5831Upper bound = 13.25 + (2.9477 * 0.2025) = 13.9169Therefore, the 99% confidence interval for µ is (12.5831, 13.9169).

This means that if we repeated the process of taking a sample of 16 values many times and calculating a confidence interval each time, we would expect that 99% of those intervals would contain the true value of µ.

To Know more about confidence interval visit:

https://brainly.com/question/32546207

#SPJ11

Given: Sample size, n = 16, Sample mean, x = 13.25, Population variance, σ² = 0.81, Confidence level = 99%. The 99% confidence interval for the population mean, µ, is (12.676, 13.824). It means that if we repeat the process of drawing samples of size 16 from the same population infinite times and calculate the confidence intervals, then 99% of those confidence intervals will contain the true population mean.

Since the sample size is greater than 30 and we have a known population variance, we can use the z-distribution for finding the confidence interval for the population mean.

We can use the following formula to find the confidence interval at a given confidence level.

x - z(α/2) * σ/√n < µ < x + z(α/2) * σ/√n, Where z(α/2) is the z-value at α/2 level of significance.

z(α/2) can be found from the standard normal distribution table.

At 99% confidence level,

α = 1 - 0.99

= 0.01.

α/2 = 0.01/2

= 0.005.

At α/2 = 0.005 level of significance,

z(α/2) = 2.576

σ = √0.81

= 0.9

Substituting the values in the formula,

x - z(α/2) * σ/√n < µ < x + z(α/2) * σ/√n

13.25 - 2.576 * 0.9/√16 < µ < 13.25 + 2.576 * 0.9/√16

13.25 - 0.574 < µ < 13.25 + 0.57412.676 < µ < 13.824

Interpretation of Interval: The 99% confidence interval for the population mean, µ, is (12.676, 13.824).

It means that if we repeat the process of drawing samples of size 16 from the same population infinite times and calculate the confidence intervals, then 99% of those confidence intervals will contain the true population mean.

To know more about z-distribution, visit:

https://brainly.com/question/31364473

#SPJ11

10.1 X1,..., Xn is an iid sequence of exponential random variables, each with expected value 5. (a) What is Var[M9(X)], the variance of the sample mean based on nine trials? (b) What is P[X * 1 > 7] . the probability that one outcome exceeds 7? (c) Use the central limit theorem to es- timate P[M * 9(X) > 7] . the probability that the sample mean of nine trials exceeds 7.
Solution:

Answers

a) Var[M9(X)] = 25/9.

b) P[X > 7] = exp(-7/5).

c) P[Z < 2/5] = 0.3446.

Given information: X1, . . . , Xn is an iid sequence of exponential random variables, each with expected value 5.

(a) We know that the sample mean based on nine trials is M9(X). Now, to calculate the variance of the sample mean based on nine trials, Var[M9(X)], we can use the formula for the variance of a sample mean, which is:

Var[M9(X)] = Var[X]/9  .

Since X is an exponential random variable with expected value 5, its variance is 5^2 = 25. Thus,Var[M9(X)] = 25/9.

(b) To find P[X * 1 > 7], we can use the probability density function of an exponential distribution, which is given by:

f(x) = 1/5 exp(-x/5), x > 0  .

Now, using this probability density function, we have:

P[X > 7] = ∫7∞f(x) dx= ∫7∞ 1/5 exp(-x/5) dx.

Using integration by substitution, with u = x/5 and du = (1/5)dx, we have:

P[X > 7] = ∫7/5∞ exp(-u) du= exp(-7/5).

(c) Since we know that X1, . . . , Xn is an iid sequence of exponential random variables, each with expected value 5 and variance 25, we can apply the central limit theorem. According to the central limit theorem, the sample mean M9(X) is approximately normally distributed with mean 5 and variance 25/9. Thus, we have:

P[M9(X) > 7] = P[Z > (7-5)/(5/3)] where Z is a standard normal random variable. This simplifies to:

P[M9(X) > 7] = P[Z > 2/5] = 1 - P[Z < 2/5]

Using the standard normal distribution table or calculator, we get:

P[Z < 2/5] = 0.6554P[M9(X) > 7] = 1 - P[Z < 2/5] = 1 - 0.6554 = 0.3446.

learn more about iid sequence here:

https://brainly.com/question/14298105

#SPJ11

A problem with a telephone line that prevents a customer from receiving or making calls is upsetting to both the customer and the telecommunications company. The data set below contains samples of 20 problems reported to two different offices of a telecommunications company and the time to clear these problems (in minutes) from the customers' lines.

a. At the 0.05 level of significance, is there evidence of a difference in the variability of the time to clear problems between the two central offices?

b. Interpret the p-value.

c. What assumption do you need to make in (a) about the two populations in order to justify your use of the F test?

Answers

The F-test requires that the two populations must be normally distributed. Therefore, in order to justify the use of the F-test, it is assumed that both populations of time to clear problems from two central offices are normally distributed

a. At the 0.05 level of significance, is there evidence of a difference in the variability of the time to clear problems between the two central offices?

For comparing the variability of the time to clear problems between the two central offices, an F-test can be used. The null hypothesis is:H0: σ12 = σ22, where σ1^2 and σ2^2 are the population variances of two central offices, and the alternative hypothesis is Ha: σ12 ≠ σ22, which means two variances are different. For this study, the significance level is 0.05. As we want to find out whether there is any difference in the variance of the time to clear the problem between two offices, a two-sample F-test can be performed.F-test statistics is given by the formula:F = s12/s22where s12 is the sample variance of the first sample (first central office), and s22 is the sample variance of the second sample (second central office).We can use Excel to calculate the F statistic.Using the given dataset, the F statistic is calculated as: σ12 = 22.66666667, σ22 = 25.25, F = 0.897949853As the F statistic is less than the F-critical value, there is no significant difference in the variability of the time to clear problems between the two central offices.b. Interpret the p-value.The p-value is the probability of observing the sample data given that the null hypothesis is true. If the p-value is less than the level of significance (α = 0.05), the null hypothesis will be rejected, and we can say that there is sufficient evidence to conclude that there is a difference in the variability of the time to clear problems between the two central offices. The p-value of this F-test is 0.467. As the p-value is greater than the level of significance, the null hypothesis is not rejected.c. What assumption do you need to make in (a) about the two populations in order to justify your use of the F test?

The F-test requires that the two populations must be normally distributed. Therefore, in order to justify the use of the F-test, it is assumed that both populations of time to clear problems from two central offices are normally distributed.

To know more about probability:

https://brainly.com/question/31828911

#SPJ11

The data set contains samples of 20 problems.

Thus, there is no evidence of a significant difference in the variance of the time to clear problems between the two central offices.

The p-value is 0.17.

Assume that the two populations have a normal distribution with equal variances.

a. The null hypothesis is that there is no difference in the variance of the time to clear problems among the two offices, while the alternative hypothesis is that there is a significant difference between the variance of the two offices. Using the F-distribution, we can test whether or not there is a difference in variance of the time to clear problems. The formula for F-value is given below:

F-value = s1^2 / s2^2

Where s1^2 and s2^2 are the variances of the two samples. With the help of the provided data, we can calculate the variances for the two samples, which are as follows:

s1^2 = 42.08

s2^2 = 22.80

Then, we can calculate the F-value as follows:

F = s1^2 / s2^2

= 42.08 / 22.80

= 1.84

Using the F-distribution table, we can find the critical value of F as 2.17 (with 19 degrees of freedom for both the numerator and denominator).Since the calculated F-value (1.84) is less than the critical value of F (2.17), we can fail to reject the null hypothesis and conclude that there is no evidence of a significant difference in the variance of the time to clear problems between the two central offices.

b. The p-value represents the probability of observing a test statistic as extreme as the one calculated, assuming that the null hypothesis is true. The p-value of the F-test can be calculated by finding the area to the right of the calculated F-value in the F-distribution table. In this case, the p-value is 0.17 (using a two-tailed test).

c. In order to use the F-test, we need to assume that the two populations have a normal distribution with equal variances. Furthermore, the samples should be independent and randomly selected. These assumptions are required in order to ensure that the F-test is valid.

To know more about variances visit

https://brainly.com/question/14116780

#SPJ11

Find ZUWT helpp plzz dont put links

Answers

Answer:

i can't see clear

Solve the given differential equation by undetermined coefficients.
y"-10y'+25y = 30x +3

Answers

The given differential equation by undetermined coefficients is y'' - 10y' + 25y = 30x + 3. Its solution is as follows: Let us assume y = yh + yp where yh is the homogeneous solution and yp is the particular solution. To find the homogeneous solution, solve the following differential equation: y'' - 10y' + 25y = 0characteristic equation: r2 - 10r + 25 = 0(r - 5)2 = 0Thus, yh = c1e5x + c2xe5x

Now, let us find the particular solution by assuming the following particular solution: yp = Ax + B Substituting this into the differential equation: y'' - 10y' + 25y = 30x + 3 yields:-10A + 25B = 3, and0x + A = 30Solving for A and B: A = 30 and B = 15Thus, yp = 30x + 15Therefore, the general solution is:y = yh + yp = c1e5x + c2xe5x + 30x + 15, where c1 and c2 are arbitrary constants.

Know more about differential equation:

https://brainly.com/question/32538700

#SPJ11

What’s the answer ?

Answers

The answer should be D
Last one
Is the correct answer

Giving Brainiest (No Links) ~Repost Cause last one no one answered~


(If you don't show work for each I comment "No Show work")

<3

Determine the slope of a line that passes through the following sets of points. Show your work.

(1, 1) and (4, 5)
(2, -1) and (4, 13)
(1, 18) and (-9, -2)

Answers

Slope is the change in y over the change in x

1. (1,1) and (4,5)

Slope = (5-1)/(4-1)

Slope = 4/3

2. (2,-1) and (4,13)

Slope = (13 - -1)/ (4-2)

Slope = 14/2

Slope = 7

3. (1,18) and (-9,-2)

Slope = (-2 -18)/(-9 -1)

Slope = -20/-10

Slope = 2

Let z = 3+ bi and w = a + bi where a, b E R. Without using a calculator, (a) determine and hence, b in terms of a such that is real.

Answers

The values of b = 0 or a = -3 -  such that zw is real, letting z = 3+ bi and w = a + bi where a, b E R.

To determine the value of b in terms of a such that zw is real, we first need to find zw. Using the distributive property, we have:

zw = (3 + bi)(a + bi)

zw = 3a + 3bi + abi - b^2

To make zw real, the imaginary part must be equal to zero. Therefore, we have:

3b + ab = 0

b(3 + a) = 0

Since b cannot be equal to zero (otherwise z and w would be real), we have:

a = -3

Therefore, b = 0 or a = -3 - this is the value of a such that zw is real.

To know more about real refer here:

https://brainly.com/question/30243872#

#SPJ11

Solve the system using elimination: 3x + 4y = 31 and 2x - 4y = -6
Please help. Thank you.

Answers

Answer:

x =5, y = 4

Step-by-step explanation:

3x + 4y = 31..... (1)

2x - 4y = -6..... (2)

Adding equations (1) & (2)

[tex]3x + \cancel{4y} = 31 \\2x - \cancel{4y} = -6\\ - - - - - - - \\ 5x = 25 \\ x = \frac{25}{5} \\ \bold{ \purple{x = 5}} \\ plug \: x = 5 \: in \: eq \: (1) \\ 3(5) + 4y = 31 \\ 15 + 4y = 31 \\ 4y = 31 - 15 \\ 4y = 16 \\ y = \frac{16}{4} \\ \bold{ \red{y = 4}}[/tex]

The lateral surface area of a triangular prism is 182 in. The height is 14 in. What is the perimeter of the prism?

Answers

Answer:

13 in

Step-by-step explanation:

Let s be the length of a side of the triangle

then one rectangular face of the triangular prism

would be s x 14.

There are 3 rectangular faces in the triangular prism so

Lateral Surface Area  = 3 x (s x 14)

182 = 42s

182/42 = s

There are 3 sides to the triangle so

3 x (182/42) = 13

andre says he can use the long division to divide 17 by 20 to get the decimal​

Answers

Answer:

0.85

Step-by-step explanation:


A circle has a diameter of 15 meters. What is its approximate circumference?

Answers

Answer:

A≈176.71

Step-by-step explanation:

A=πr^2

We find the radius by slicing the diameter in half. The radius is half of the diameter.

A = A=π 7.5^2

A=π 56.25

A≈176.71

Cosine of 60 degrees

Answers

Answer:

1/2

Step-by-step explanation:

Its value is 1/2.

Hope it helps :)

price marked at R85 with VAT included​

Answers

Answer: No image? Incomplete question? FREE POINTS!

Step-by-step explanation:

BRAINLIEST PLEASE!

A student earns $10 per hour for tutoring and 57 per hour as a teachers aide To have enough free time for studies, he can work no more than 20 hours per week. The storing center requires that each tutor spends at least three hours per week tutoring, but no more than eight hours per week How many hours should he work to maximize his earnings hours of tutoring hours as a teacher's aide What is the maximum profit An automotive plant makes the Quartz and the Pacer. The plant has a maximum production capacity of 1200 cars per week, and they can make at most 600 Quartz cars and 800 Pacers each week. If the profit on a Quartz is $500 and the profit on a Pacer is $800, find how many of each type of car the plant should produce. Quartz Pacers What is the maximum profit? A manufacturer of ski clothing makes ski pants and ski jackets. The profit on a pair of ski pants is $2.00 and the profit on a jacket is $1.50. Both pants and jackets require the work of sewing operators and cutters. There are 60 minutes of sewing operator time and 45 minutes of cutter time available. It takes 8 minutes to sew one pair of ski pants and 4 minutes to sew one jacket. Cutters take 4 minutes on pants and 8 minutes on a jacket Find the number of pants and jackets the manufacturer should make in order to maximize the profit pairs of pants Jackets. What is the maximum profits ?

Answers

To maximize his earnings, the student should work 8 hours tutoring and 12 hours as a teacher's aide. The plant should produce 600 Quartz cars and 600 Pacers to maximize the profit. The maximum profit is $660,000.The manufacturer should make 1 pair of ski pants and 7 ski jackets to maximize the profit. The maximum profit is $29.00.

Part A:

To maximize his earnings, the student should work 8 hours tutoring and 12 hours as a teacher's aide.

The maximum profit is $786.00.

Part B:

Let's say, the plant make x number of Quartz and y number of Pacers.

Therefore, x + y = 1200 ----(1)

and, 500x + 800y = Profit Maximize.

Let's multiply Equation (1) by -500 and add it to Equation (2) so that we can solve for

y. -500x - 500y = -600000500x + 800y = Profit Maximize-300y = -180000 ⇒ y = 600

Therefore, x = 600

Hence, the plant should produce 600 Quartz cars and 600 Pacers to maximize the profit. The maximum profit is $660,000.

Part C:

Let's say, the manufacturer should make x pairs of ski pants and y ski jackets.

Therefore, the system of linear equations are as follows:

8x + 4y ≤ 60 (sewing operator time)4x + 8y ≤ 45 (cutter time)

Let's plot the graph to solve the linear equations. The feasible region is shaded in the following graph:

To find the maximum profits, we need to check all the coordinates of the feasible region.

8(1) + 4(7) = 368(2) + 4(6) = 242(3) + 4(5) = 224(5) + 4(4) = 20

Profit for (1,7) = $29.00

Profit for (2,6) = $26.00

Profit for (3,5) = $23.00

Profit for (5,4) = $18.00

Therefore, the manufacturer should make 1 pair of ski pants and 7 ski jackets to maximize the profit. The maximum profit is $29.00.

Learn more about maximum profit at https://brainly.com/question/17200182

#SPJ11

Write the following answers in the form ' x/y or p%'

Answer

Answers

It’s bro 5!59 13 so time to you to get F

Find the volume of a pyramid with a square base, where the perimeter of the base is 8.7\text{ ft}8.7 ft and the height of the pyramid is 9.2\text{ ft}9.2 ft. Round your answer to the nearest tenth of a cubic foot.

Answers

Answer:

696.348

Step-by-step explanation:

Answer:

14.5

Step-by-step explanation:

Answer quickly pllllllllllsssssss

Answers

D. X>-1


Says I need 20 characters so I’m typing this

help me plz and thank you

Answers

Answer:

6

10

Step-by-step explanation:

30 5 6

70 7 10

Which statement best describes how the author of “The Train to Somewhere” alters historical details to tell her story?

A.The author includes historical facts, such as when the Children’s Aid Society was formed.
B.The author describes the experiences and feelings of an imaginary orphan who was sent west on an orphan train.
C. The author provides specific details about families who agreed with Brace’s beliefs about ways to help needy orphan children.
D.The author explores the adventures of two young children as they start their new lives on a farm in rural America.

Answers

Answer:

The statement that best describes how the author of "The Train to Somewhere" alters historical details to tell her story is option B;

B. The author describes the experiences and feelings of an imaginary orphan who was sent west on an orphan train

Step-by-step explanation:

The author included the experiences of one of the children who according to the historical details in the historical account of the Orphan Train Riders were aided by the minister, Charles Loring Brace, to be taken from the New York City streets on the East to other states and Canada to the West

The child, a 5 year old girl, who had lost both parents had been living on the street with her brother for some months

The author also highlighted the taught by the child, of being separated from her brother at one of the destination towns of the train, and the manifestation of the beliefs of the minister, Brace, of the children finding loving families that would help them become productive members of society.

Two people are trying to decide whether a die is fair. They roll it 100 times, with the results shown
21 ones, 15 twos, 13 threes, 17 fours, 19 fives, 15 sixes
Average of numbers rolled = 3.43, SD = 1.76 One person wants to make a z-test, the other wants to make a test X^2.
a. True or false: the correct test for this question with these data is the z-test. FALSE No matter what you answer above, carry out the X^2 test.

Expected frequency for each face (number) of the die= _______ (round answer to the nearest 0.1).

c. Number of degrees of freedom: df = ________

d. X^2 = ________
e. P = _________

Answers

Two people are trying to decide whether a die is fair. The correct test for analyzing the fairness of the die with the given data is the chi-square [tex]X^2[/tex] test, not the z-test.

The z-test is used for analyzing data when we have known population parameters, such as the mean and standard deviation. However, in this case, we are dealing with categorical data (the frequencies of each face of the die), and we want to determine if the observed frequencies significantly differ from the expected frequencies.

To perform the chi-square test, we first need to calculate the expected frequency for each face of the die. The expected frequency is calculated by multiplying the total number of rolls (100) by the probability of each face (1/6, assuming a fair die). Each face of the die is expected to occur approximately 16.67 times (100/6 = 16.67).

Next, we calculate the degrees of freedom (df) for the chi-square test. For a fair die with 6 faces, the df is (number of categories - 1), which is 5 in this case.

Then, we calculate the chi-square statistic[tex](X^2)[/tex] by summing the squared differences between the observed and expected frequencies, divided by the expected frequencies. The [tex]X^2[/tex] value is used to assess the goodness-of-fit between the observed and expected frequencies.

Finally, we determine the p-value associated with the calculated [tex]X^2[/tex]value using the chi-square distribution and the degrees of freedom. The p-value indicates the likelihood of observing the data if the die is fair.

To provide the specific values for the expected frequency, degrees of freedom, [tex]X^2[/tex], and p-value, the actual calculations based on the given data are required.

Learn more about degrees here:

https://brainly.com/question/364572

#SPJ11

Other Questions
if his eyes have a far point of 2.0 m , what is the greatest distance he can stand from the mirror and still see his image clearly? express your answer using two significant figures. Consider the following premerger information about Firm X and Firm Y: Firm X Firm Y Total earnings $96,000 $22,500 Shares outstanding 53,000 18,000 Per-share values: Market $53 $18 Book $14 $8 Assume that Firm X acquires Firm Y by issuing long-term debt to purchases all the shares outstanding at a merger premium of $5 per share. Construct the post-merger balance sheet for Firm X assuming the use of the purchase accounting method. Blended payments on a 54000 loan were $425 per month interest was charged at 6.2% per annum calculated on the urpad balance. How mach of the first progeste Select one $2007 o Ob $9.41 Od $58.35 $404.3 Please help me hurry Who painted the image above? London Confections is known for its rich dark chocolate fudge truffles. London sells its fudge truffles to local retailers. A "unit" of fudge truffles is a 10-pound batch. The standard quantities of ingredients for a batch include 11 cups of sugar, 17 ounces of chocolate chips, 21 ounces of butter, and 27 ounces of evaporated milk. The standard costs for each of the ingredients are as follows: $0.23 per cup of sugar, $0.20 per ounce of chocolate chips, $0.12 per ounce of butter, and $0.05 per ounce of evaporated milk. Calculate the standard direct material cost per batch of fudge truffles. Calculate the standard direct material (DM) cost per batch of fudge truffles. Of the following, which was not a provision of the Versailles Treaty?? Once a scientist has examined all of the facts, performed experiments to test their question, and analyzed the results, then they can form a method hypothesis consensus theory Moving to another question will save this response. uestion 2 15 point Pretty Lady Cosmetic Products has an average production process time of 40 days. Finished goods are kept on hand for an average of 15 days before they are sold. Accounts receivable are outstanding an avera and the firm receives 40 days of credit on its purchases from suppliers. Assume net sales of $1,200,000 and cost of goods sold of $900,000. Determine the average investment in accounts receivable, inventories, and accounts payable. What would be the net financing need conside three accounts? *Note: To solve this problem, you will need to first find the Inventory Period, the Receivables Period, and the Payment Period. $153.054.79 $154,054.79 $152.054.79 $152,154.80 A parent interest group is looking at whether birth order affects scores on the ACT test. It was suggested that, on average, first-born children earn lower ACT scores than second-born children. After surveying a random sample of 100100 first-born children, the parents group found that they had a mean score of 23.823.8 on the ACT. A survey of 250250 second-born children resulted in a mean ACT score of 24.124.1. Assume that the population standard deviation for first-born children is known to be 1.21.2 points and the population standard deviation for second-born children is known to be 2.42.4 points. Is there sufficient evidence at the 1%1% level of significance to say that the mean ACT score of first-born children is lower than the mean ACT score of second-born children? Let first-born children be Population 1 and let second-born children be Population 2.Step 1 of 3 :State the null and alternative hypotheses for the test. Fill in the blank below.Step 2: What is the Test StatisticStep 3: Do we reject or fail to reject the null hypothesis? Do we have sufficient or insufficient data? PLEASE HELP In the film you selected, how is lighting used? Is it more practical or aesthetic? What techniques were used? Explain the overall tone of the film, and how that might have affected the lighting choices? (i used casablanca for this assignment) Which number line shows the solutions of 13x8x+6? Write 8 x 8 x 8 x 8 in exponential notation Answer for brainliest Which of the following processes in project time management involves identifying the specific tasks that the project team members and stakeholders must perform to produce the project deliverables?a) Defining activitiesb) Sequencing activitiesc) Developing the scheduled) Estimating activity durations Solve the equation and determine the value of t.t + 38 = 420t = What can you say about Assume labour is the only factor of production in countries Anarres and Urras. In Anarres, production of 1 heat pump requires 3 hours of labour input and 1 solar panel requires 2 hours of labour input. In Urras, production of 1 heat pump requires 6 hours of labour input and 1 solar panel requires 3 hours of labour input. Determine which ONE of the following is a valid terms of trade between the two countries at which they will both benefit from trade: A 2.25 solar panels for each heat pump. B 2 solar panels for each heat pump. C 1.75 solar panels for each heat pump. D 1.5 solar panels for each heat pump. Graph y=2x+1Can you please help. Which of the following does not describe Jacques Cartier?He made three voyages to Canada.He discovered the St. Lawrence River.The Indians taught him how to survive in the wilderness.He returned to France with large amounts of gold and silver. Which of the following SQL statement will return all of the CUSTOMER whose last name begins with Dunn?Group of answer choicesSELECT * FROM CUSTOMER WHERE CUS_LNAME LIKE 'Dunn%';SELECT * FROM CUSTOMER WHERE CUS_LNAME = 'Dunn%';SELECT * FROM CUSTOMER WHERE CUS_LNAME IN 'Dunn%';SELECT * FROM CUSTOMER WHERE CUS_LNAME IS 'Dunn';