Question: A car gets a mean of 18 mpg. Test to see if a cheaper grade of gasoline made any difference in the gas miles at the .01 level. A sample of 38 fillups with the

cheaper gas got a mean of 17.8 mpg and a standard deviation of 0.6. State the

hypotheses and identify the claim, find the critical value(s), compute the test

value, make the decision, summarize the results.