Mathematics, 17.04.2020 20:27 xxaurorabluexx
A manufacturer claims that the mean lifetime of its drill is 1000 hours. A homeowner selects 25 drills and finds the mean lifetime to be 980 hours with a sample standard deviation of 80 hours. If = 0.05, test the manufacturer's claim.
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A manufacturer claims that the mean lifetime of its drill is 1000 hours. A homeowner selects 25 dril...
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