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 5 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:

μ

σ

greater than>

less than<

equals=

not equals≠ 5

Upper H 1H1:

μ

σ

not equals≠

equals=

less than<

greater than>

5



(b) Both engines took exactly 19 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