Question

Population 1 has a mean of 20 and a variance of 100. Population 2 has a...

Population 1 has a mean of 20 and a variance of 100. Population 2 has a mean of 15 and a variance of 64. You sample 20 objects from Population 1 and 16 objects from Population-2. What is the mean and the variance of the sampling distribution of the difference between population means (Pop.1 – Pop.2); respectively?

5 and 2

5 and 9

5 and 3

None of the above

Math   Statistics-And-Probability   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

Answer:  5 and 9

Explanation:

= 20, = 100, n1 = 20

= 15, = 64, n2 = 16

the mean of the sampling distribution of the difference between population means is

  

= 20 - 15

= 5

the variance of the sampling distribution of the difference between population means is

=

= 5 + 4

= 9

Answer = 5 and 9

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
A random sample of size 64 is taken from a population with mean µ = 17...
A random sample of size 64 is taken from a population with mean µ = 17 and standard deviation σ = 16. What are the expected value and the standard deviation for the sampling distribution of the sample mean? 17 and 2, respectively. 17 and 64, respectively. 17 and 16, respectively. 17 and 1, respectively.
A random sample of size 64 is taken from a population with mean µ = 17...
A random sample of size 64 is taken from a population with mean µ = 17 and standard deviation σ = 16. What are the expected value and the standard deviation for the sampling distribution of the sample mean? 17 and 2, respectively. 17 and 64, respectively. 17 and 16, respectively. 17 and 1, respectively.
Mean = 20 Variance = 16 1) What is the sample mean at which 65% of...
Mean = 20 Variance = 16 1) What is the sample mean at which 65% of the data falls at or below? 2) What is the sample mean at which 82% of the data falls at or above? 3) Within what two sample means do 90% of the means fall (i.e. symmetrically)?
A population parameter has a normal distribution and has a mean of 45 and variance of...
A population parameter has a normal distribution and has a mean of 45 and variance of 15. From this population a sample is selected with a size of 19 and the variance of the sample is 17. Does this sample support the population variance? Evaluate.
Suppose the height of individuals in a population follow a normal distribution with a mean (μ)...
Suppose the height of individuals in a population follow a normal distribution with a mean (μ) of 66 inches and a standard deviation (σ) of 4 inches. a) Using the statistical software R, sample n individuals from the distribution described above. For N=10,000 iterations, compute the average height for n=5, n=15, n=50, n=100 individuals and plot a histogram of the sampling distribution of the Z score (?̅−??/√? ) b) Using the statistical software R, sample n individuals from the distribution...
A population has a mean mu equals=75 and a standard deviation sigmaσequals=8. Find the mean and...
A population has a mean mu equals=75 and a standard deviation sigmaσequals=8. Find the mean and standard deviation of a sampling distribution ​( muμx​ &​) of sample means with sample size n=64
1. Calculate the mean and standard deviation for the numbers 1 – 20. ​i.e.) 1, 2,...
1. Calculate the mean and standard deviation for the numbers 1 – 20. ​i.e.) 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20 ​Note: The set of numbers will be considered the population. ​µ = _______​​​σ = ________ 2. With your calculator, randomly generate 5 numbers from the numbers 1 – 20, 30 times. ​Use:​[MATH]>>>PRB #5 ​​RandInt(1,20,5)​[ENTER]​​Note: You cannothave the same number repeated in the group of 5. ​​​​​​For...
If the population mean is 1000 For n = 9 ,16 , 25 , 49, 100,...
If the population mean is 1000 For n = 9 ,16 , 25 , 49, 100, 400 , 900, 1600, 2500, 4000, 10000 Compute the sample mean for each value If the population standard deviation is 100 What is the sample means standard deviation For n = 9 ,16 , 25 , 49, 100, 400 , 900, 1600, 2500, 4000, 10000 How does the variance change as we increase the sample size?
A normal population has mean 100 and variance 25. How large must the random sample be...
A normal population has mean 100 and variance 25. How large must the random sample be if you want the standard error of the sample average to be 1.5? (also calculate the probability of the average exceeds 105 based on 16 observations from this normal population)
Consider an infinite population with a mean of 100 and a standard deviation of 20. A...
Consider an infinite population with a mean of 100 and a standard deviation of 20. A random sample of size 64 is taken from this population. The standard deviation of the sample mean equals 2.50. True or False
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT