CHAPTER 9
Quantifying Process Variation
The successful quality system will address several aspects of process and product control. Effective controls may be established only after understanding the fundamental nature of the variation to be controlled.
Descriptive Statistics
Typically, descriptive statistics are computed to describe properties of empirical distributions, that is, distributions of data from samples. There are three areas of interest: the distribution’s location or central tendency, its dispersion, and its shape. The analyst may also ...
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