MATH 1113:

Section 8.2 Homework

Answer each question to the best of your ability. Show your calculations (they can be verified on a calculator). Your final answer should be in the form of a complete sentence.

A random sample of n = 31 American households is asked how many TV sets there are in the household. The responses are as follows:

1 0 2 3 2 3 4 2 1 1 2

4 3 2 3 3 0 1 0 1 3 2

4 3 2 1 4 0 1 2 3

1. What is the mean number of TVs for the sample?

2. What is the standard deviation for the sample?

3. What is the best estimate for the mean number of TVs for the population of all American households?

4. What is the 95% confidence interval for the estimate in part (c)?

5. Comment on the reliability of the estimate.