Which of the following statements are true?
A) It is important to ensure that a process is under control with respect to location (equivalently, central tendency) as well as variation.
B) Most practitioners recommend that control of a process be established on variation prior to constructing an $\bar { X }$
Chart or any other chart for controlling location.
C) Charts for variation are based on the sample standard deviation S and also based on the sample range R.
D) Charts for variation that are based on the sample standard deviation S are generally preferred over charts that are based on the sample range R because the standard deviation gives a more efficient assessment of variation than does the range.
E) All of the above statements are true.

Question

Quizplus · Accepted Answer

All the statements provided are true regarding process control and the use of statistical process control (SPC) charts. A) emphasizes the importance of controlling both the central tendency and variation. B) suggests establishing control on variation before focusing on location, which is a common practice. C) mentions that variation charts can be based on both the sample standard deviation (S) and the sample range (R), which is accurate. D) states a preference for standard deviation-based charts over range-based charts due to the more efficient assessment of variation, which is a widely accepted view among practitioners.

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

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