Question: A simple random sample of 60 items resulted in a sample mean of 80. The population standard deviation is = 15. a. Compute the 95%

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

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

Enter your answer using parentheses and a comma, in the form (n1,n2). Do not use commas in your numerical answer (i.e. use 1200 instead of 1,200, etc.)

b. Assume that the same sample mean was obtained from a sample of 120 items. Provide a 95% confidence interval for the population mean. Round your answers to two decimal places.

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