question archive State university uses thousands of fluorescent light bulbs each year
State university uses thousands of fluorescent light bulbs each year
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State university uses thousands of fluorescent light bulbs each year. The brand of bulb it currently used has a mean life of 800 hours. A competitor claims that its bulbs, which cost the same as the branch the university currently uses, have a mean life of more than 800 hours. The university has decided to purchase the new branch if, when tested, the evidence supports the manufacturer's claim at the .05 significance level. Suppose 121 bulbs were tested with the following results: =827.5 hours, s=100 hours. Conduct the test using α=.05.
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