In the early years of the twenty-first century, annual salaries for federal employees in the Upper Midwest averaged approximately $42,000, with a population standard deviationof $4,900. If we drew a random sampleof 25 federal employees from this population:

What would the standard errorof the meanbe?

What is the probabilitythat the sample mean would be between $41,000 and $43,000?

What is the probability that the sample mean would be between $41,000 and $43,000 if we increased the sample size to 100?

In the early years of the twenty-first century, annual salaries for federal employees in the Upper Midwest averaged approximately $42,000, with a population standard deviation (?) of $4,900. If we drew a random sample of 25 federal employees from this population:

1) What would the standard error of the mean be?

Given that sigma=$4,900 and n=25. The standard error of the mean would be

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The standard errors of the mean and determine probabilities are determined. Probability sample means are examined.