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Statistics for Six Sigma Made Easy
book

Statistics for Six Sigma Made Easy

by Warren Brussee
June 2004
Beginner
250 pages
6h 26m
English
McGraw-Hill
Content preview from Statistics for Six Sigma Made Easy

16.1. TRADITIONAL CONTROL CHARTS

Traditional control charts have two graphs.

The top graph is based on the process average, with statistically based control rules and limits telling the operator when the process is in or out of control. This graph cannot have any reference to the product tolerance because it displays product averages. By definition, a tolerance is for individual parts and is meaningless on averages. When tolerances are displayed on traditional control charts, which people sometimes try to do, they make no sense and can give an erroneous message that a process is running well when it isn't.

Displaying Tolerances on Control Charts ...

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Publisher Resources

ISBN: 9780071433853