Mathematics, 13.12.2019 01:31, yesseniaroman21
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?
Answers: 2
Mathematics, 21.06.2019 12:30, kmshacklette9879
Jackson drew 4 hearts and 29 circles. what is the ratio of circles to all shapes?
Answers: 1
The lifetime (in hours) of a 60-watt light bulb is a random variable that has a normal distribution...
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