Question: A simple random sample of 20 items resulted in a sample mean of 70 . The population standard deviation is 20. a. Compute the 95%

A simple random sample of 20 items resulted in a sample mean of 70 . The population standard deviation is 20.

a. Compute the 95% confidence interval for the population mean. Round your answers to one decimal place.

b. Assume that the same sample mean was obtained from a sample of 110 items. Provide a 95%confidence interval for the population mean. Round your answers to two decimal places.

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