Which of the Following Statements Are True?
A) Generally Speaking $\alpha , \text { and } \beta$

Which of the following statements are true?

A) Generally speaking, a control chart will be effective if it gives very few out-of-control signals when the process is I control, but shows a point outside the control limits almost as soon as the process goes out of control.
B) One assessment of a control chart's effectiveness is based on the notion of "error probabilities" $\alpha , \text { and } \beta$
C) The use of a 3-sigma limits for an $\bar { X }$
Chart makes it highly unlikely that an out-of-control signal will result from an in-control process.
D) One assessment of a control chart's effectiveness involves the average run length (ARL) needed to observe an out-of-control signal.
E) All of the above statements are true.