A Bell-Shaped Distribution Does Not Imply Only Common Cause Variation

A Bell-Shaped Distribution Does Not Imply Only Common Cause Variation

By Discovery Lean Six Sigma

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A Bell-Shaped Distribution Does Not Imply Only Common Cause Variation
Random does not imply normal
 

 

Some practitioners think that if data from a process have a “bell-shaped” histogram, then the system is experiencing only common cause variation (i.e., random variation). This is incorrect and reflects a fundamental misunderstanding about the relationship between distribution shape and the variation in a system. However, even knowledgeable people sometime make this mistake.

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Original: https://www.qualitydigest.com/inside/six-sigma-article/bell-shaped-distribution-does-not-imply-only-common-cause-variation-091817
By: Quality Digest
Posted: September 18, 2017, 7:03 pm

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