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Alex Ar [27]
3 years ago
5

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.
Mathematics
1 answer:
gregori [183]3 years ago
6 0

 Construct a 99% confidence interval for life expectancy of a new GE light bulb:<span>

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

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

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