Which of the following statements about process quality control is NOT true? A.

Question

Which of the following statements about process quality control is NOT true? A. None of the listed answers B. Assignable cause variation is also referred as special cause variation C. Common cause variation can be eliminated from the process by removing the potential causes D. An observation outside the control limits is an example of a special cause of variation E. The control limits will include 99.74% of the population under the normal probability distribution assuming that the process is in control

Explanation / Answer

Following statement about process quality control is not true.

C. Common casue variation can be eliminated from the process by removing the potential causes.

beacuse,

Common cause variation is fluctuation caused by unknown factors resulting in a steady but random distribution of output around the average of the data. The variations from unknown factors can not be eliminated.

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