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Commercializing Great Products with Design for Six Sigma by David W. Bacon, Randy C. Perry

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Chapter 26. Statistical Analysis Tools Overview

Variation occurs in practically everything we do. The ingredient amounts we use to bake a cake on one occasion will almost certainly be different the next ten times we bake that same cake. The time that it takes us to travel on a business trip to the same destination will be different each time we travel that same route. Sometimes the amount of variation we experience is important and noticeable, while at other times it is insignificant. Why does variation happen? There are many reasons. We have variation due to unexpected changes in the things we use to perform a task. We have variation because we perform a task differently each time we do it. We experience variation because we are unable to measure ...

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