Essay
A manufacturer claims that the mean lifetime of its fluorescent bulbs is 1000 hours. A homeowner selects 25
bulbs and finds the mean lifetime to be 980 hours with a standard deviation of 80 hours. If α = 0.05, test the
manufacturerʹs claim using confidence intervals.
Correct Answer:
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Confidence interval (946.98, 1...View Answer
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Correct Answer:
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