How do we know when a process is in control?
A)The control chart shows sample means that are randomly distributed between the control limits.
B)Each observation sampled is drawn from an identical distribution.
C)The control chart shows no patterns or cycles in the plotted sample means.
D)All of these choices are true.

Question

How do we know when a process is in control?
A)The control chart shows sample means that are randomly distributed between the control limits. 
B)Each observation sampled is drawn from an identical distribution. 
C)The control chart shows no patterns or cycles in the plotted sample means. 
D)All of these choices are true.

Quizplus · Accepted Answer

All of the choices listed are indicators of a process being in control. A control chart with sample means that are randomly distributed between control limits, observations sampled from an identical distribution, and no patterns or cycles in the plotted sample means are all indications that the process is stable and consistent. Therefore, all of the choices listed are true indicators of a process being in control.

How Do We Know When a Process Is in Control