Which of the following observed on a control chart suggests a process that is NOT in control?
A) Points follow a smooth pattern from the lower control limit to the upper control limit.
B) The number of points above and below the center line is about the same.
C) Points fall randomly above and below the center line.
D) No points are outside the control limits.

Question

Quizplus · Accepted Answer

A smooth pattern from the lower control limit to the upper control limit suggests a systematic variation, indicating the process is not in control. Random variation is expected in a controlled process.

Which of the Following Observed on a Control Chart Suggests