Power+,Inc. produces AA batteries used in remote controlled toy cars. The mean life of these batteries follows the normal probability distribution with a mean of 37 hours and a standard deviation of 5.5 hours. As part of its quality assurance program, Power+, Inc. tests samples of 9 batteries

a) What can you say about the shape of the distribution of the sample mean?

Binomial

Uniform

Normal

b) what is the standard error of the distribution of the sample mean? (Round your answer to 4 decimal place

A population consists of the following five values 2,3,5,5, and 7.

a) List all samples of size 2 from left to right using without replacement, and compute the mean of each sample (Round your mean values to 1 decimal place. )

Sample. Values. Sum. Mean

1

2

3

4

5

6

7

8

9

10

b) Compute the mean of the distribution of sample means and the population mean (Round your answers to 1 decimal place.)