75. Edmunds.com would like to test the hypothesis that the average age of an imported car on the road is greater than the average age of a domestic car. The following data shows the sample size and the average age of cars for import and domestic cars along with the population standard deviations. Define Population 1 as import cars and Population 2 as domestic cars and use the critical value approach to test this hypothesis with a = 0.05. Construct a 90% confidence interval for the difference in population mean and interpret the results. - Population standard deviation 3.2 years 2.8 years