Question

An automobile manufacturer has given its van a 39.9

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 260vans, they found a mean MPG of 40.2. Assume the population variance is known to be 5.29. Is there sufficient evidence at the 0.1

level to support the testing firm's claim?

Step 1 of 6 :

State the null and alternative hypotheses.

Answer 1

since p value is less than 0.1 level, we reject null hypothesis.