When no point lies outside the control limits of a chart,we conclude that variation in the process is:
A)caused by chance and there is not enough evidence to infer that the process is out of control.
B)caused by chance and there is enough evidence to infer that the process is out of control.
C)caused by assignable causes and there is enough evidence to infer that the process is under control.
D)caused by assignable causes and there is not enough evidence to infer that the process is out of control.

Question

Quizplus · Accepted Answer

When all points lie within the control limits, it is an indication that the process variation is due to common causes (chance), and there is not enough evidence to conclude that the process is out of control. It means that the process is stable and in control. Therefore, the best choice is A.

When No Point Lies Outside the Control Limits of a Chart,we