The owner of a gasoline station wants to study gasoline purchasing habits by motorists at his station. He selects a random sample of 55 motorists during a certain week, with the following results: • The amount purchased was XBar = 11.0gallons, S = 3.3 gallons. • 15 motorists purchased premium-grade gasoline. a. At the 0.05 level of significance, is there evidence that the population mean purchase was different from 10 gallons? What is your answer to (a) if the sample mean equals 11.3 gallons? What is your answer to (c) if 7 motorists purchased premium gasoline?

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