An automobile manufacturer claims that their jeep has a 55.8 miles/gallon (MPG) rating. An independent testing firm has been contracted to test
the MPG for this jeep. After testing 220 jeeps they found a mean MPG of 55.9. Assume the variance is known to be 4.41. Is there sufficient evidence
at the 0.02 level that the jeeps outperform the manufacturer's MPG rating?
Step 2 of 5: Enter the value of the z test statistic.
