- Hypothesis Testing
- Frequentist Inference
- Confidence Interval
Confidence Interval, Average expected Lifetime
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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
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b) If an executive can say the the average expected lifetime is 2,200, is he right?
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