The marketing manager for an automobile manufacturer is interested in determining the proportion of newcompact-car owners who would have purchased a GPS navigation system 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 newcompact-car owners is selected and 79 indicate that they would have purchased the GPS navigation system. If you were to conduct a test to determine whether there is evidence that the proportion is different from0.30, which test would youuse?

A.

t-test of population mean

B.

Z-test of a population mean

C.

Z-test of a population proportion

D.

t-test of a population proportion