A state University uses thousands of fluorescent light bulbs each year. The brand of bulb it currently uses has a mean life of 890 hours. A competitor claims that its bulbs, which cost the same as the brand the university currently uses, have a mean life of more than 890 hours. The university has decided to purchase the new brand if, when tested, the evidence supports the manufacturer’s claim at the 0.05  significance level. Suppose 23 bulbs were tested with the following x=915 hours, and S=84 hours. at 5% significance level find the correct rejection region




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