The life in hours of a 100-watt bulb is known to be approximately normally distr
ID: 2917570 • Letter: T
Question
The life in hours of a 100-watt bulb is known to be approximately normally distributed. A random sample of 20 bulbs has a mean life of 2050 hours standard deviation of 12.5 hours. Construct a 95% two-sided confidence interval on the mean life. Also: Suppose we want the total width of the confidence interval on mean life to be five hours. What sample size should be used: if the desired confidence level is 95%? Note that the half-width of the confidence interval is equal to maximum error in estimation.Explanation / Answer
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