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A manufacturer claims that the mean lifetime of its fluorescent bulbs is 1000 hours. A homeowner selects 40 bulbs and finds the mean lifetime to

A manufacturer claims that the mean lifetime of its fluorescent bulbs is 1000 hours. A

homeowner selects 40 bulbs and finds the mean lifetime to be 980 hours with a standard

deviation of 50 hours. Test the manufacturer's claim. Use = 0.05.

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