23. An oil company claims that the sulfur content of its diesel fuel is at most .15...

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23. 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?

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