The manufacturer of Prolong Engine Treatment claims that if you add one 12-ounce bottle of its $20 product your engine will be protected from excessive wear. An infomercial claims that a woman drove 4 hours without oil, thanks to Prolong. Consumer Reports magazine tested engines in which they added Prolong to the motor oil, ran the engines, drained the oil, and then determined the time until the engines seized.
(a) Determine the null and alternative hypotheses that Consumer Reports will test.
(b) Both engines took exactly 13 minutes to seize. What conclusion might Consumer Reports draw based on this evidence?