The control limits in a control chart can be interpreted to mean:
A) any value falling outside the limits is a defect and the product should be discarded.
B) the range of virtually all special cause variation.
C) any value falling within the limits means the product is high quality.
D) the range of virtually all common cause variation.

Question

Quizplus · Accepted Answer

Control limits on a control chart are designed to reflect the range of expected variation due to common causes, not special causes. They help in identifying when a process is operating within its normal range of variability (common cause variation) and when it is not (indicating potential special cause variation).

The Control Limits in a Control Chart Can Be Interpreted