4. (12%) A consumer research group is interested in testing an automobile manufacturer’s claim that a new economy model will travel at least 25 miles per gallon of gasoline (H0: μ ≥ 25). Assume that s is 3 miles per gallon.
申論題內容
(2) What is the probability of committing a Type II error if the actual mileage is 23 miles per
gallon?