The manufacturer of a certain engine treatment claims that if you add their prod

Question

The manufacturer of a certain engine treatment claims that if you add their product to your engine, it will be protected from excessive wear. An infomercial claims that a woman drove 66 hours without oil, thanks to the engine treatment. A magazine tested engines in which they added the treatment to the motor oil, ran the engines, drained the oil, and then determined the time until the engines seized. Complete parts (a) and (b) below.

(a) Determine the null and alternative hypotheses that the magazine will test. Upper H0: __, ___ 6 , Upper H1: ____, ____ 6

(b) Both engines took exactly 15 minutes to seize. What conclusion might the magazine make based on this evidence?

A. The infomercial's claim is true.

B. The infomercial's claim is not true.

Explanation / Answer

a) Ho : mu=66 hours

where mu is mean time until the engine seized

against H1: mu > 66 hours

b) b. The infomercial's claim is not true

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