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

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.

(a) Calculate the p-value needed to test whether the company’s claim is valid.
(b) Use part (a) to conclude the test at the 5 and 10 percent levels of significance.

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