For $\bar { X }$ charts, a set of eight tests can be used to signify that a process is out of control."Out of control" is indicated if:
A)all eight tests are positive.
B)only one of eight is positive.
C)more than half the tests are positive.
D)half or more tests are "borderline."

Question

Quizplus · Accepted Answer

For $\bar { X }$ charts, a process is considered out of control if any one of the eight tests is positive. Each test is designed to detect a different kind of process variation or shift, so even a single positive test indicates a potential issue.

For Xˉ\bar { X }Xˉ Charts, a Set of Eight Tests Can Be Used to Tests

For $\bar { X }$ Charts, a Set of Eight Tests Can Be Used to Tests