When special cause variation is detected, it is normally eliminated by increasing the number of standard deviations (z value) used to calculate the control limits.

Question

Quizplus · Accepted Answer

Increasing the number of standard deviations used to calculate control limits does not eliminate special cause variation; it only makes the control limits wider, potentially masking the variation rather than addressing its root cause.

When Special Cause Variation Is Detected, It Is Normally Eliminated