According to the text, the most common choice of limits for control charts is usually
A) ± 1 standard deviation
B) ± 2 standard deviations
C) ± 3 standard deviations
D) ± 3 standard deviations for means and ± 2 standard deviations for ranges
E) none of the above

Question

Quizplus · Accepted Answer

The most common choice of limits for control charts is ± 3 standard deviations. This is because it provides a good balance between detecting potential problems and avoiding false alarms. It allows for some natural variation in the process, while still flagging any points outside of the limits as potential issues to be investigated.

According to the Text, the Most Common Choice of Limits