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A simple random sample of60items resulted in a sample mean of 80. The population standard deviation is =15. Compute the95%confidence interval for the population mean.

A simple random sample of60items resulted in a sample mean of 80. The population standard deviation is =15.

Compute the95%confidence interval for the population mean. Round your answers to one decimal place

Assume that the same sample mean was obtained from a sample of 120items. Provide a95% confidence interval for the population mean. Round your answers to two decimal places.

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