The six sigma methodology is well rooted in statistics and statistical mathematics.
Six sigma means a measure of quality that strives for near perfection. The objective of six sigma suality is to reduce process output variation so that on a long term basis.
Six sigma has evolved over time. The concepts behind six sigma can be traced through the centuries as the method took shape into what it is today.
As the process sigma value increases from zero to six, the variation of the process around the mean value decreases.
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