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Confidence Interval, Average expected Lifetime

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October 6th, 2022

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Pg 2-2

A GE flourescent bulb’s useful life is normally distrbuted. We wish to estimate the mean lifetime. A random sample of 15 bulbs are:

2,222 hrs standard deviation of 310 hrs

Refer to table 7A

a) Determine 95% confidence interval
b) If an executive can say the the average expected lifetime is 2,200, is he right?

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