A car manufacturer claims that its vehicles average at least 28 miles
A car manufacturer claims that its vehicles average at least 28 miles per gallon. Suppose, in fact, the cars only get 26.5 miles per gallon on average, with a population variance of 1. For an appropriate hypothesis test at a .975 confidence level, what is the power of a test of the company’s claim using a sample size of 4 cars?
a. .1492 b. .4658 c. .6543 d. .8508 e. .9236
a. 6.53 b. 9.45 c. 14.7 d. 16.2 e. 17.8