Which of the Following Statements Are True?
A) a Defect $\bar { X }$

Multiple Choice

Which of the following statements are true?

A) A defect on the traditional $\bar { X }$
Chart is its inability to detect a relatively small change in a process mean.
B) Whether a process is judged out of control at a particular time depends only on the sample at that time, and not on the past history of the process.
C) The computational version of a cumulative sum (CUSUM) procedure is used almost exclusively in practice, but the logic behind the procedure is most easily grasped by first considering the graphical form.
D) All of the above statements are true.
E) None of the above statements are true.