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    Confidence Interval Estimate - Lifetime of Light Bulbs

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    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.

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    https://brainmass.com/statistics/confidence-interval/confidence-interval-estimate-lifetime-light-bulbs-506331

    Solution Summary

    This solution helps with a problem regarding confidence intervals.

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