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​:μσ

greater than>

less than<

equals=

not equals≠ 5

Upper H 1H1​:μσ

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