Which of the following is not one of the criteria for determining if a control chart indicates that a process is not statistically stable?
A) Exceptional value
B) Upward shift
C) Downward trend
D) Decreasing variation

Question

Quizplus · Accepted Answer

Decreasing variation is not a criterion for determining if a process is not statistically stable. Instead, decreasing variation might indicate an improvement in process stability. The other options (exceptional value, upward shift, and downward trend) are considered signs that a process might be out of control or not statistically stable.

Which of the Following Is Not One of the Criteria