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8 March, 06:49

Construct a 99% confidence interval for life expectancy of a new GE light bulb. 64 bulbs are randomly selected and a mean of 750 hours and a standard deviation of 20 hours is found. Assume the distribution of life expectancy is normally distributed.

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  1. 8 March, 10:25
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    Construct a 99% confidence interval for life expectancy of a new GE light bulb:

    n = 64

    Xbar = 750

    s. d. = 20

    Critical z value at 99% confidence = 2.576

    margin of Error, E = 2.576*20/√64 = 6.44

    99% confidence interval for life expectancy of a new GE light bulb = (Xbar - E; Xbar + E) = (743.56; 756.44)
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