Which of the following statements are not true?
A) An in-control process is simply one that is operating in a stable fashion, reflecting only natural random variation.
B) An out-of-control "signal" occurs whenever a plotted point falls outside the two control limits.
C) There is a strong analogy between the logic of control charting and hypothesis testing. The null hypothesis here is that the process is out-of-control.
D) The two control limits are designed so that an in-control process generates very few false alarms, whereas a process not in control quickly gives rise to a point outside the limits.
E) All of the above statements are true.

Question

Quizplus · Accepted Answer

The null hypothesis in the context of control charting is that the process is in control, not out-of-control. The purpose of control charting is to detect evidence that contradicts this hypothesis, indicating potential issues with the process.

Which of the Following Statements Are Not True