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A random sample of 16 mid-sized cars, which were tested for fuel consumption, gave a mean...

A random sample of 16 mid-sized cars, which were tested for fuel consumption, gave a mean of 26.4 miles per gallon with a standard deviation of 2.3 miles per gallon. Assuming that the miles per gallon given by all mid-sized cars have a normal distribution, find a 90% confidence interval for the population mean.

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