Question: The owner of a gasoline station wants to study gasoline purchasing habits by motorists at his station. He selects a random sample of 60 motorists during a certain week, with the following results:

        The amount purchased was \(\bar{X}\) = 11.3 gallons, S = 3.1 gallons

        Eleven motorists purchased premium-grade gasoline.

1. At the 0.05 level of significance, is there evidence that the population mean purchase was different from 10 gallons?
2. Determine the p -value in (a).
3. At he 0.05 level significance, is there evidence that less than 20% of all the motorists at the station purchased premium-grade gasoline?
4. What is your answer to (a) if the sample mean equals 10.3 gallons?
5. What is your answer to (c) if 7 motorists purchased premium-grade gasoline?

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Solution: The downloadable solution consists of 4 pages
Deliverable: Word Document