The Average Gasoline Price of One of the Major Oil $\sigma$

question 32

Essay

The average gasoline price of one of the major oil companies has been $2.20 per gallon. Because of cost reduction measures, it is believed that there has been a significant reduction in the average price. In order to test this belief, we randomly selected a sample of 36 of the company's gas stations and determined that the average price for the stations in the sample was $2.14. Assume that the standard deviation of the population ( $\sigma$ ) is $0.12.
a.State the null and the alternative hypotheses.
b.Compute the test statistic.
c.What is the p-value associated with the above sample results?
d.At 95% confidence, test the company's claim.