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 is $0.12.