For control charts, which of the following situations means that the process is not in control?
A) A measured observation is above the LCL
B) A measured observation is below the UCL
C) A measured observation is above the center line
D) A measured observation is below the center line
E) A measured observation is above the UCL

Question

Quizplus · Accepted Answer

A measured observation above the UCL indicates that the process is not in control and is experiencing special cause variation. The UCL represents the upper limit of expected variation if the process is in control, so any observation above this value suggests that something unusual is happening in the process. The other options (A-D) may indicate potential issues, but they do not definitively suggest that the process is out of control.

For Control Charts, Which of the Following Situations Means That