An automobile mileage study tested the following hypotheses.
Hypothesis:
H0:u>(or equal to) 25 mpg
Conclusion:
Manufacturer's claim supported
Hypothesis:
Ha: u < 25 mpg
Conclusion:
Manufacturer's claim rejected; average mileage per gallon less than stated
For o~ = 3 and a .02 level of significance, what sample size would be recommended if the researcher wants 80% chance of detecting that u is less than 25 miles per gallon when it is actually 24?