Question: hello can you help me answer this question Question: A quality control manager wants to estimate with 90% confidence the mean lifespan of light bulbs.

hello can you help me answer this question

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A quality control manager wants to estimate with 90% confidence the mean lifespan of light bulbs. How large a sample should the manager take, for this estimate to be within 20 hours of the true mean? Assume the population standard deviation is 100 hours.

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