The mean annual salary of a sample of 400 office managers is $45,090 with a standard deviation of $8,820. Calculate the margin of error and construct the 98% confidence interval for the true population mean annual salary for office managers.

We may assume that the sample standard deviation s is an accurate approximation of the population standard deviation (i.e., s ), given that the sample size is so large (n > 200).

Standard Normal Distribution Table

E=E=

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