You take a sample of 30 from a large population of test scores, and the mean of your sample is 70.
(a) You know that the standard deviation of the population is 12. What is the 99% confidence interval on the population mean.
(b) Now assume that you do NOT know the population standard deviation, but the standard deviation of your sample is 12. What is the 99% confidence interval on the mean now?
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Sep 13, 2020EXPERT
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