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A) Compute a 95% confidence interval estimate for the population mean number of miles that residents of Detroit travel per day in a car.

B) What assumption must you make in order to calculate the confidence interval in part A?

C) Suppose it is desired to estimate the population mean number of miles with a margin of error of ± 2 miles at 95% confidence. Do the data provide this desired level of precision? What action, if any, would you recommend be taken?

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