Mathematics, 20.11.2019 23:31, cameronbeaugh

The lifetime (in hours) of a 60-watt light bulb is a random variable that has a normal distribution with σ = 30 hours. a random sample of 25 bulbs put on test produced a sample mean lifetime of = 1038. construct a 92% confidence interval estimate for the mean lifetime μ. if it were desired to cut the confidence interval to half its length while keeping the same 92% level, what size sample would be required to achieve this?

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The lifetime (in hours) of a 60-watt light bulb is a random variable that has a normal distribution...