Concept explainers
The American Society for Quality (ASQ) conducted a Salary of all its members. ASQ members work in all manufacturing and service-related institutions, with a common theme of an interest in quality. Two job titles are black belt and green belt. (See Section 19.6 for a description of these titles in a Six Sigma quality improvement initiative.)
a. Using a 0.05 level of significance, is there a difference in the variability of salaries between belts and green belts?
b. Based on the results of (a), which t test defined in Section 10.1 is appropriate for
comparing
c. Using a 0.05 level of significance, is the mean salary of black belts greater than the mean
salary of green belts?
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BASIC BUSINESS STATISTICS-STUD.SOLN.MAN
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