A manufacturer claims that the mean lifetime of its fluorescent bulbs is 1300 hours. A homeowner...

A manufacturer claims that the mean lifetime of its fluorescent bulbs is 1300 hours. A homeowner selects 25 bulbs and finds the mean lifetime to be 1270 hours with a standard deviation of 80 hours. Test the manufacturer's claim. Use α = 0.05.

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orchestra answered 1 year ago

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