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. Upper H 0​: ▼ p mu sigma ▼ 4 Upper H 1​: ▼ sigma mu p ▼ greater than equals less than not equals 4 ​(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 not true. B. The​ infomercial's claim is true.

Answer 1