The owner of a gasoline station wants to study gasoline purchasing habits of motorists at his station. He selects a random sample of 60 motorists during a certain week with the following data. The average amount purchased is 11.3 gallons with a standard deviation of 3.1 gallons. At a 5% significance level, is there sufficient evidence that the mean amount of gasoline purchased by the motorists differs from 10 gallons?

b) State the test statistic

c) What are the critical value(s), the value of the test statistic and the p-value?

d) What is your conclusion and the type of error that can be committed?