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Question
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.
| Domestic | Import | |
| Sample mean | 9.4 years | 10.8 years |
| Sample size | 33 | 36 |
| Population standard deviation | 3.2 years | 2.8 years |
Define Population 1 as import cars and Population 2 as domestic cars and use the p-value value approach to test this hypothesis with 
= 0.05.
Answer
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