Question: A simple random sample of 144 items resulted in a sample mean of 950. The population standard deviation is known to be 170. Develop a

A simple random sample of 144 items resulted in a sample mean of 950. The population standard deviation is known to be 170. Develop a 95% confidence interval for the population mean. If we wanted a margin of error of $25 and alpha = 0.01, what sample size would we need?

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