An automobile manufacturer has given its jeep a 38.5 miles/gallon (MPG) rating. An independent testing firm has been contracted to test the actual MPG for this jeep since it is believed that the jeep performs over the manufacturer's MPG rating. After testing 260 jeeps, they found a mean MPG of 38.8. Assume the population standard deviation is known to be 2.1. Is there sufficient evidence at the 0.02 level to support the testing firm's claim? Find the value of the test statistic. Round your answer to two decimal places.
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Null hypothesis: The actual MPG for the jeep is equal to or less than the manufacturer's MPG rating of 38.8. Alternative hypothesis: The actual MPG for the jeep is greater than the manufacturer's MPG rating of 38.8. Show more…
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