Edmunds.com would like to test the hypothesis that the standard deviation for the age of an imported car on the road is greater than the standard deviation for the age of a domestic car.The following data shows the ages of a random sample of import and domestic cars. Which of the following would be the correct hypothesis test?

Question

Edmunds.com would like to test the hypothesis that the standard deviation for the age of an imported car on the road is greater than the standard deviation for the age of a domestic car.The following data shows the ages of a random sample of import and domestic cars.  Which of the following would be the correct hypothesis test?

Quizplus · Accepted Answer

The correct hypothesis test would be a two-tailed t-test for the difference in standard deviations between the two populations. Choice B shows the correct setup for this test, with the null hypothesis stating that the standard deviation for the age of an imported car is equal to or less than the standard deviation for the age of a domestic car, and the alternative hypothesis stating that the standard deviation for the age of an imported car is greater than the standard deviation for the age of a domestic car.

EdmundsCom Would Like to Test the Hypothesis That the Standard