Question

An oil company claims that the sulfur content of its diesel fuel is at most .15 percent. To check this claim, the sulfur contents of 40 randomly chosen samples were determined; the resulting sample mean and sample standard deviation were .162 and.040. Using the 5 percent level of significance, can we conclude that the company's claims are invalid?

Answer 1

No, it would have to have been greater than .192 to invalidate the claim.

Explanation: