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22-11-2019
Mathematics

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The life in hours of a 75-watt light bulb is known to be normally distributed with σ = 25 hours. Suppose that you wanted the total width of the two-sided confidence interval on the mean life to be six hours at 95% confidence. What sample size should be used?

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graceodunlami graceodunlami

24-11-2019

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