RE: Six Sigma and The Empirical Rule

Subject: RE: Six Sigma and The Empirical Rule
From: Bergeret Francois-r21445 <Francois.Bergeret@motorola.com>
Date: Wed, 12 Mar 2003 08:06:10 +0100

"Six Sigma" refer to a one-sided data spread (either to the right or left of the mean) for a total of 12 sigma data dispersion range. The goal of Six Sigma is to reduce variation (sigma) in order to obtain a defect rate very close to zero. Assuming that sigma is small enough so that specification limits are at +/- 6 sigma around the mean, 2 parts per billion are outside +/- 6 sigma. Six Sigma is a concept invented by Motorola in order to reduce variation to increase quality and reduce costs. 

Regards
Francois

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