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Fifteen SmartCars were randomly selected and the highway mileage of each was noted. The analysis yielded a mean of 47 miles per gallon and a

Fifteen SmartCars were randomly selected and the highway mileage of each was noted. The analysis yielded a mean of 47 miles per gallon and a standard deviation of 5 miles per gallon. Write the equation with answer that would represent a 90% confidence interval for the average highwaymileage of all SmartCars?

Is this t - interval or Z-interval?? How do I even solve this?

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