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 4 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.

H0​: _____, _______ 4

▼ sigma σ mu μ p

▼ = ,≠,> ,<

H1​: _____, _______ 4

▼ mu,μ,sigma σ,p

▼ = ,≠,> ,<

​(b) Both engines took exactly 12 12 minutes to seize. What conclusion might the magazine make based on this​ evidence?

A. The​ infomercial's claim is not true.

B. The​ infomercial's claim is true.

Answer 1