The American Society for Quality (ASQ) conducted a salary survey of all its members. ASQ members work in all areas of manufacturing and service-related institutions, with a common theme of an interest in quality. For the survey, emails were sent to 58,614 members, and 7,869 valid responses were received. The two most common job titles were manager and quality engineer. Another title is Master Black Belt, who is a person who takes a leadership role as the keeper of the Six Sigma process (see Section 17.8). An additional title is Green Belt, someone who works on Six Sigma projects part-time. Descriptive statistics concerning salaries for these four titles are given in the following table:

Compare the salaries of Green Belts, managers, quality engineers, and Master Black Belts.

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Sample Standard Title Size Minimum Maximum Deviation Mean Median Green Belt Manager 2,128 22,568 Quality Engineer Master Black Belt 34 33,000 106,000 18,137 65,679 64,750 182,000 25,078 86,349 84,000 186,000 19,256 4,314 72,100 1,262 24,000 132 33,000 201,000 24.988 109,48 106,000