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A simple random sample of 20 items resulted in a sample mean of 40. The population standard deviation is = 15. a. Compute the 95%

A simple random sample of 20 items resulted in a sample mean of 40. The population standard deviation is = 15.

a. Compute the 95% confidence interval for the population mean. round to one decimal place ( , )

b. Assume that the same sample mean was obtained from a sample of 120 items. provide a 95% confidence interval for the population mean. Round our answers to two decimal places. ( , )

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