Treating common cause variation as special cause variation is known as interference.

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Treating common cause variation as special cause variation is known as mistaking common causes for special causes, not interference. Interference refers to external factors that may cause variation in a process. Treating common cause variation as special cause variation is known as a mistake or error of interpretation, but it is not called interference. Interference refers to any external factors or events that affect a process and lead to variation, beyond the common or special causes.

Treating Common Cause Variation as Special Cause Variation Is Known