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In a detailing automobile shop, the desired average time to fully detail a car is 2.5 hours. A recent random sample of 16 jobs revealed

In a detailing automobile shop, the desired average time to fully detail a car is 2.5 hours. A recent random sample of 16 jobs revealed an average time of 3 hours per car. The population standard deviation is known to be 0.5 hours. Test whether this sample indicates that the hours to fully detail a car is different from the desired. Let = 0.01. A full hypothesis is required.

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