Question 10 of 15 Step 1 of 5 00:57:22 An automobile manufacturer claims that th

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Question 10 of 15 Step 1 of 5 00:57:22 An automobile manufacturer claims that their van has a 40.6 miles/ gallon (MPG) rating. An independent testing firm has been contracted to test the MPG for this van. After testing 27 vans they found a mean MPG of 41.0 with a standard deviation of 2.1. Is there sufficient evidence at the 0.05 level that the vans outperform the manufacturer's MPG rating? Assume the population distribution is approximately normal Step 1 of 5: State the null and alternative hypotheses. Answer 2 Points Keypad | Tables Ho: Ha

Explanation / Answer

Ho: <= 40.6
Ha: > 40.6

Test statistic, z = (x-)/(s/sqrt(n)) = (41-40.6)/(2.1/sqrt(27)) = 0.99

p-value(one sided) = 0.1611

p-value > 0.05

Fail to reject null hypothesis, there is no sufficient evidence to suggest the vans outperform the manufacturers MPG rating

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