In statistical process control,the range is often used as a substitute for the standard deviation.

Name: In statistical process control,the range is often used as a substitute for the standard deviation.
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The range is used as an estimate of standard deviation in certain control charts, such as the X-bar and R charts. However, it is not always an appropriate substitute for the standard deviation, and other control charts, such as the X-bar and s charts, use the standard deviation directly.

In Statistical Process Control,the Range Is Often Used as a Substitute