Chapter 8.3, Problem 20E

For Exercises 7 through 23, perform each of the following steps.

a. State the hypotheses and identify the claim.

b. Find the critical value(s).

c. Find the test value.

d. Make the decision.

e. Summarize the results.

Use the traditional method of hypothesis testing unless otherwise specified.

20. Average Family Size The average family size was reported as 3.18. A random sample of families in a particular school district resulted in the following family sizes:

At α = 0.05, does the average family size differ from the national average?

Source: New York Times Almanac.