A random sample of lifetime of 49 ultraillum light bulbs

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Reference no: EM13473025

A random sample of the lifetime of 49 UltraIllum light bulbs has a mean of 3,960 hours and a standard deviation of 200 hours. Construct a 95% confidence interval estimate of the mean lifetime for all UltraIllum light bulbs.

Reference no: EM13473025

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