a. Random samples of size 121 are taken. Find the mean and variance of the sample mean. b. How would the answers to (a) change if the size of samples were 400 instead of 121?

Extracted text: a. Random samples of size 121 are taken. Find the mean and variance of the sample mean. b. How would the answers to (a) change if the size of samples were 400 instead of 121?


Extracted text: Direction: Solve the following: 1. Random samples of size 225 are drawn from a population with mean 100 and standard deviation 20. Find the mean and variance of the sample mean. 2. Random samples of size 64 are drawn from a population with mean 32 and standard deviation 5. Find the mean and variance of the sample mean. 3. A population has mean 75 and standard deviation 12.