February 2014
Intermediate to advanced
627 pages
22h 25m
English
Content preview from Quality Management for Organizations Using Lean Six Sigma Techniques
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329Chapter fteen: Analyze
As the Six Sigma culture grows within the business organization, it will become more
common to hear process performance referred to in terms of Z-score. The spreadsheet
table can be used to quickly convert to the process yield, PPM, etc. given a stated Z-score.
For example, the process yield corresponding to a Z-score of 3.0 is about 99.83 (%) by visual
interpolation. The process defective rate corresponding to a Z-score of 3.0 is approximately
1700 (ppm), again by visual interpolation (Table 15.3).
The process performance can be evaluated using several approaches. In the rst
approach, we assess performance using lot ...
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