Chapter 11.1, Problem 16E

For Exercises 5 through 18, perform these steps.

a. State the hypotheses and identify the claim.

b. Find the critical value.

c. Compute the test value.

d. Make the decision.

e. Summarize the results.

16. Types of Automobiles Purchased In a recent year U.S. retail automobile sales were categorized as listed below. luxury 16.0% large 4.6% midsize 39.8% small 39.6% A random sample of 150 recent purchases indicated the following results: 25 were luxury models, 12 were large cars, 60 were midsize, and 53 were small. At the 0.10 level of significance, is there sufficient evidence to conclude that the proportions of each type of car purchased differed from the report?

Source: World Almanac.