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A simple random sample of 60 items resulted in a sample mean of 77. The population standard deviation is 17. a. Compute the 95% confidence

A simple random sample of 60 items resulted in a sample mean of 77. The population standard deviation is 17.

a. Compute the 95% confidence interval for the population mean (to 1 decimal).

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b. Assume that the same sample mean was obtained from a sample of 120 items. Provide a 95% confidence interval for the population mean (to 2 decimals).

( , )

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