Given a sample of 100 projector bulbs from a company has a mean length of life of 20.5 hours with a standard deviation of 1.6 hours, how do I find a 95% confidence interval for the average length of life of those bulbs and then interpret the results?
Md Ariful Islam
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এমবিএ(মার্কেটিং)
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Dr. Md Rushad Rahman
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পিজিটি(মেডিসিন)
20.6 is the upper limit and 20.4 is the lower limit. There is 95% confidence that the constructed interval includes the population mean.
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