Which of the following is not a rule for determining if a process is out of control?
A)A single point is outside the control limits
B)Nine data points in a row are on the same side of the center line
C)Six points in a row are increasing
D)An obvious pattern persists
E)Three points are on the center line

Question

Quizplus · Accepted Answer

Three points on the center line does not necessarily indicate that a process is out of control. It is only a warning signal to investigate further, but it does not confirm that a process is out of control. The other options (A, B, C, and D) are all indicators of an out-of-control process according to common statistical process control rules.

Which of the Following Is Not a Rule for Determining