Assume you are working at the Consumer ProtecTon Agency. Recently, you have been geng complaints

about the highway gas mileage of a new minivan. he car company agrees to allow you to select

randomly 40 of its new minivans to test their highway mileage. he company claims that its minivans get

28 miles per gallon on the highway. Your results show a mean of 26.7 and a standard deviaTon of 4.2.

You are not certain if you should create a conFdence interval or run a hypothesis test. You decide to do

both at the same Tme. You run a one-tail test, two-tail test, and a conFdence interval. You decide to

accept an alpha risk of 0.05.