Confidence interval and population mean

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Reference no: EM1391768

A simple random sample of 60 items resulted in a sample mean of 90. The population standard deviation is 12.

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

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).

c. What is the effect of a larger sample size on the margin of error?

Reference no: EM1391768

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