Question: A random sample of 27 Exxon customers used an average of 16.1 gallons to fill their vehicle with a sample standard deviation of 5.4 gallons.

A random sample of 27 Exxon customers used an average of 16.1 gallons to fill their vehicle with a sample standard deviation of 5.4 gallons. Determine the 99% confidence interval for this sample.

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