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a sample of 250 observations is selected from a normal population for which the population standard deviation is known to be 25. the sample mean

a sample of 250 observations is selected from a normal population for which the population standard deviation is known to be 25. the sample mean is 20. a. determine the standard error of the mean. b. explain why we can use formula (9-1) to determine the 95% confidence interval. c. determine the 95% confidence interval for the population mean.

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