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Hypothesis Testing

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Citrus Rental is a popular car rental agency that has a history of having too few cars available, so that its available cars are overdriven. The mean monthly mileage over the years for Citrus cars has been about 1600 miles per month.
Recently, though, Citrus purchased thousands of new cars, and the company claims that the average mileage of its cars is now less than in the past. To test this, a random sample of 9 recent mileages of Citrus cars was taken. The mean of these 9 mileages was 1557 miles per month, and the standard deviation was 201 miles per month.

Assume that the population of recent monthly mileages of Citrus cars is normally distributed. At the 0.05 level of significance, can it be concluded that the mean recent monthly mileage, , of Citrus cars is less than 1600 miles per month?

Perform a one-tailed test.

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Hypothesis Testing

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