The Marketing Manager for an Automobile Manufacturer Is Interested in Determining

Multiple Choice

The marketing manager for an automobile manufacturer is interested in determining the proportion of new compact-car owners who would have purchased a passenger-side inflatable air bag if it had been available for an additional cost of $300. The manager believes from previous information that the proportion is 0.30. Suppose that a survey of 200 new compact-car owners is selected and 79 indicate that they would have purchased the inflatable air bags. If you were to conduct a test to determine whether there is evidence that the proportion is different from 0.30, which test would you use?

A) Z-test of a population proportion
B) t-test of a population proportion
C) Z-test of a population mean
D) t-test of population mean