題組內容

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.

(1) With a 0.02 level of significance and a sample of 30 cars, what is the rejection rule based on the value of x for the test to determine whether the manufacturer’s claim should be rejected?