An automobile mileage study tested the following hypothesis:
Hypothesis Conclusion
Ho:µ? 25 Manufacturer's claim supported
Ha:µ< 25 Manufacturer's claim rejected; average mileage per gallon less than stated.
For o=3 and a.02 level of significane, what sample size would be recommended if the researcher wants an 80% chance of deteching that µ is less than 25 miles per gallon when it is actually 24?