Question: A simple random sample of 60 items resulted in a sample mean of 80. The population standard deviation is = 15. a. Compute the

A simple random sample of 60 items resulted in a sample mean of 80. The population standard deviation is σ = 15.
a. Compute the 95% confidence interval for the population mean.
b. Assume that the same sample mean was obtained from a sample of 120 items. Provide a 95% confidence interval for the population mean.
c. What is the effect of a larger sample size on the interval estimate?

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