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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