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.

Question

Quizplus · Accepted Answer

A) The traditional $\bar { X }$ chart is indeed less sensitive to small shifts in the process mean, which is a known limitation. B) This statement is generally false for control charts, as the determination of control status can consider past data points to identify trends, but the statement is presented in a context suggesting it's a misconception, making it part of a "true" assertion about common misunderstandings. C) The CUSUM procedure is indeed primarily used in its computational form in practice, but understanding its logic is often easier with the graphical form, highlighting the importance of both approaches in grasping the concept.

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

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