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According to a study several years ago, the average annual earnings of a BMW driver was $82 600. A researcher believes the average annual earnings

According to a study several years ago, the average annual earnings of a BMW driver was $82 600.

A researcher believes the average annual earnings of a BMW driver is now lower than $82 600 per year. To test this hypothesis, a random sample of 18 BMW drivers is selected and the average annual salary is found to be $78 974, with a population standard deviation known to be $7810 per year.

Using = .01, test the researcher's hypothesis. Assume annual salaries are normally distributed.

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