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Nancy Joon, Inc. has 1500 employees. A simple random sample of 81 employees was selected, and...

Nancy Joon, Inc. has 1500 employees. A simple random sample of 81 employees was selected, and the
individuals in the sample were asked how much they contribute (monthly) to their retirement accounts.
The sample mean, , was $150 with a standard deviation, s, of $45.
a. Estimate the standard error of the mean.
b. Develop an approximate 95% confidence interval for the population mean.

Math   Statistics-And-Probability   
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