A sample value above the upper control limit (UCL) or below the lower control limit (LCL) calls for:
A)process shutdown.
B)an immediate second sample.
C)additional tests.
D)further investigation.

Question

Quizplus · Accepted Answer

A sample value above the UCL or below the LCL indicates that the process is out of control and there may be some error or variation in the process. As a result, further investigation is required to identify the root cause of the issue and take corrective action to bring the process back under control. Option D is the best choice.

A Sample Value Above the Upper Control Limit (UCL) or Below