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The average cost of owning and operating an automobile is $8121 per 15000 miles. A random...

The average cost of owning and operating an automobile is $8121 per 15000 miles. A random survey of 40 automobile owners revealed an average cost of $8350 with a population standard deviation of $750. At the one percent level of significance is there sufficient evidence to conclude that the average is greater than $8121? Use critical values to perform your test.

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