Purchase Solution

Standard Deviation of Officials in Student Services Salaries

Not what you're looking for?

Ask Custom Question

If 45 officials in student services earned an average of x(with a line over it) = $50,340 each year:

a. Assume that the standard deviation is 16,920 fro salaries of officials . Find the 90% confidence interval for the population mean salary of such personal. What is the margin of error.
b. If SD is 10,780, Find the 90% confidence interval and margin of error?
c.If SD is 4830.00, find the 90% confidence interval and margin of error?
d. Compare the lengths of confidence intervals in a-c, As the sd decreases does the length of the 90% confidence level decrease?

Purchase this Solution

Solution Summary

The solution finds the confidence intervals and margin of error with varying standard deviations.

Purchase this Solution


Free BrainMass Quizzes
Know Your Statistical Concepts

Each question is a choice-summary multiple choice question that presents you with a statistical concept and then 4 numbered statements. You must decide which (if any) of the numbered statements is/are true as they relate to the statistical concept.

Measures of Central Tendency

Tests knowledge of the three main measures of central tendency, including some simple calculation questions.

Measures of Central Tendency

This quiz evaluates the students understanding of the measures of central tendency seen in statistics. This quiz is specifically designed to incorporate the measures of central tendency as they relate to psychological research.

Terms and Definitions for Statistics

This quiz covers basic terms and definitions of statistics.