In statistical process control, the range often substitutes for the standard deviation.

Question

Quizplus · Accepted Answer

This is true. In some situations, it may be difficult or time-consuming to calculate the standard deviation for a process, so the range is used as a quick and easy estimate of the variability of the data. However, the range is less precise than the standard deviation and should only be used as a substitute in certain cases.

In Statistical Process Control, the Range Often Substitutes for the Standard