The Lean Six Sigma Pocket Toolbook by Michael L. George & David Rowlands & Mark Price & John Maxey

Author:Michael L. George & David Rowlands & Mark Price & John Maxey
Language: eng
Format: epub
Publisher: McGraw-Hill
Published: 2005-03-25T16:00:00+00:00

2 out of 3 points in a row in Zone A or beyond: Detects a shift in the process average or increase in the standard deviation. Any two out of three points provide a positive test.

4 out of 5 points in Zone B or beyond: Detects a shift in the process mean. Any four out of five points provide a positive test.

15 points in a row in Zone C, above and below the centerline: Detects stratification of subgroups—appears when observations in a subgroup come from sources with different means.

8 points in a row on both sides of the centerline with none in Zone C: Detects stratification of subgroups when the observations in one subgroup come from a single source, but subgroups come from different sources with different means.

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