An auto maker estimates that the mean gas mileage of its luxury sedan is at least 25 miles per gallon. A random sample of eight such cars has a mean of 23 miles per gallon and a standard deviation of 5 miles per gallon. At Î±=0.05, can you reject the auto maker's claim that the mean gas mileage of its luxury sedan is at least 25 miles per gallon? (Assume the population is normally distributed).
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