Posted by **TIMBERLY** on Thursday, April 7, 2011 at 5:35pm.

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.

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

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

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