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A simple random sample of 30 items resulted in a sample mean of 60. The population standard deviation is 10. a. Compute the 95 %

A simple random sample of 30 items resulted in a sample mean of 60. The population standard deviation is 10.

a. Compute the 95 % confidence interval for the population mean. Round your answers to one decimal place. ( ____,_____ )

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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