Assignable cause variation refers to variation in the output of a process that is naturally occurring, expected, and that may be the result of random causes.

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Quizplus · Accepted Answer

This statement is actually describing common cause variation, not assignable cause variation. Assignable cause variation refers to variation that is caused by specific, identifiable factors that can be addressed and eliminated to improve process output.

Assignable Cause Variation Refers to Variation in the Output of a Process