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## Finding the 90% confidence interval for the population mean and margin of error.

Salaries: Student Services Consider college official in admissions, registration, counseling, financial aid, campus ministry, food services, and so on. How much money do these people make each year? Suppose you read in your local newspaper that 45 officials in student services earned an average of  = \$50,340 each year (Reference: chronicle of Higher Education).

(a) Assume that σ = \$16,920 for salaries of college officials in student services. Find a 90% confidence interval for the population mean salary of such personnel. What is the margin of error?

(b) Assume that σ = \$10,780 for salaries of college officials in student services. Find a 90% confidence interval for the population mean salary of such personnel. What is the margin of error?

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