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An automobile manufacturer claims that their car has a 33.7 miles/gallon (MPG) rating. An independent testing...

An automobile manufacturer claims that their car has a 33.7 miles/gallon (MPG) rating. An independent testing firm has been contracted to test the MPG for this car. After testing 12 cars they found a mean MPG of 34.0 with a variance of 2.56. Is there sufficient evidence at the 0.05 level that the cars have an incorrect manufacturer's MPG rating? Assume the population distribution is approximately normal. Step 4 of 5 : Determine the decision rule for rejecting the null hypothesis. Round your answer to three decimal places.

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