Question

An automobile manufacturer has given its van a 50.4 miles/gallon (MPG) rating. An independent testing firm has been contracted to test the actual MPG for this van since it is believed that the van performs over the manufacturer's MPG rating. After testing 290 vans, they found a mean MPG of 50.6. Assume the population standard deviation is known to be 2.1. Is there sufficient evidence at the 0.05 level to support the testing firm's claim?

Step 4 of 6:

Find the P-value of the test statistic. Round your answer to four decimal places.

Answer 1

rt,、 从150.4 :50.6 50, 6-50. ч 2.1 1,6218 o052Y evidence to ujat r。k hence