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# An auto maker estimates that the mean gas mileage of its sport utility vehicle is 20 miles per gallon.

An auto maker estimates that the mean gas mileage of its sport utility vehicle is 20 miles per gallon. A random sample of 8 such vehicles had a mean of 18 per gallon and a standard deviation of 5 miles per gallon. At α=0.05, can you reject the auto maker’s claim that the mean gas mileage of its sports utility vehicle is 20 miles per gallon? Assume the population is normally distributed.