To finish this scenario, use the Sample Size Estimator Sheets A, B of this file.
In the previous years of the twenty-first century, annual salaries for federal employees in the Upper Midwest averaged approximately $42,000, with a population standard deviation (σ) of $4,900. If we drew a random sample of 25 federal employees from this population:
What would the standard error of the mean be?
What is the probability that the sample mean would be among $41,000 and $43,000?
What is the probability that the sample mean would be among $41,000 and $43,000 if we enhanced the sample size to 100