Which of the following statements is false regarding control charts?
A)If we view using a control chart as a graphical hypothesis test, the null hypothesis is that the process has not changed.
B)A type I error in control charting results in an unnecessary adjustment to the process.
C)A type II error in control charting results in an unnecessary adjustment to the process.
D)A process within which special cause variation is present is said to be out of control.
E)A process which exhibits only common cause variation is said to be in control.

Question

Quizplus · Accepted Answer

A Type II error in control charting occurs when a chart fails to detect a shift or change in the process that has actually occurred, not when it results in an unnecessary adjustment. An unnecessary adjustment is typically the result of a Type I error, where the process is believed to be out of control when it is actually in control.

Which of the Following Statements Is False Regarding Control Charts