The marketing manager for an automobile manufacturer is interested in determining the proportion of new compact-car owners who would have purchased a knee airbag 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 knee airbag. If you were to conduct a test to determine whether there is evidence that the proportion is different from 0.30 and decided not to reject the null hypothesis, what conclusion could you reach?
A) There is not sufficient evidence that the proportion is not 0.30.
B) There is sufficient evidence that the proportion is not 0.30.
C) There is not sufficient evidence that the proportion is 0.30.
D) There is sufficient evidence that the proportion is 0.30.
Question 2
The marketing manager for an automobile manufacturer is interested in determining the proportion of new compact-car owners who would have purchased a side curtain 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 side curtain 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
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