Suppose that a firm has historically been achieving "Three Sigma" quality. If the firm later changes its quality management practices such that it begins to achieve "Six Sigma" quality, which of the following phenomena will result?
A) The average number of defects will be cut in half.
B) The specification limits will be moved twice as far from the mean.
C) The average number of defects will be cut by 99.9997%.
D) The average number of defects will be cut by 99.87%.
E) The average number of defects will be cut by 99.73%.

Question

Quizplus · Accepted Answer

Achieving "Six Sigma" quality means reducing the number of defects to 3.4 per million opportunities, which is a reduction of 99.9997%. Therefore, the average number of defects will be cut by 99.87%, which is closest to option D. Options A, B, and E are incorrect as they do not reflect the magnitude of improvement associated with Six Sigma quality.

Suppose That a Firm Has Historically Been Achieving "Three Sigma