According to the text, what is the most common choice of limits for control charts?
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) ±6 standard deviations

Question

Quizplus · Accepted Answer

The most common choice of limits for control charts is ±3 standard deviations because it provides a balance between detecting meaningful changes in the process while minimizing false alarms. Choosing a narrower limit may fail to detect important changes, while choosing a wider limit may result in too many false alarms.

According to the Text, What Is the Most Common Choice