Question: You suspect that IT support calls from senior managers take longer than calls from staffers. You take a sample of 35 calls from senior managers

You suspect that IT support calls from senior managers take longer than calls from staffers. You take a sample of 35 calls from senior managers and find a sample average of 22.1 minutes per call; for staffers, a sample of size 45 gave a mean of 19.6 minutes. Assume that you know the standard deviation (not variance) for each population (6.3 for senior managers and 5.8 for staffers).

For this question, perform your calculation using the formulas--do not use the Analysis Toolpak tools. For all parts, use senior managers as population 1 and staffers as population 2.

Question: a.) Determine the point estimate for the difference between population means.

b.) determing a confidence interval for the difference in population means, at the 95% confidence level. What is the z or t score to be used (to at least three decimals)?

c.) What is the margin of error (E) (to at least three decimals)?

d.) What is the LOWER limit of the interval (to at least three decimals)?

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