An automobile mileage study tested the following hypotheses.

HypothesisConclusion

H0:

25 mpgManufacturer's claim supported

Ha:< 25 mpgManufacturer's claim rejected;

average mileage per gallon less than stated

For= 3 and a .02 level of significance, what sample size would be recommended if the researcher wants an 80% chance of detecting thatis less than 25 miles per gallon when it is actually 24 (to the next whole number)?