Which of the Following Statements Are Not True?
A) If $\Delta$

Which of the following statements are not true?

A) If we let $\Delta$
Denote the size of a shift in a process mean $\mu$
That is to be quickly detected using a CUSUM procedure, then it is common practice to let $k = 2 \Delta$
Where k denotes the slope of the lower arm of the V-mask.
B) A quality control practitioner may specify a desired value of an ARL (average run length) when the process is in control $\left( \mu = \mu _ { 0 } \right)$
C) A quality control practitioner may specify a desire value of an ARL (average run length) when the process is out of control because the mean has shifted by $\Delta \left( \mu = \mu _ { 0 } + \Delta \text { or } \mu = \mu _ { 0 } - \Delta \right)$
D) All of the above statements are true.
E) None of the above statements are true.