Control limits for the mean are symmetrical around $\bar { \bar { X } }$ , and control limits for the range around $\bar { R }$ are also symmetrical.

Question

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Control limits for the mean are symmetrical around $\bar { \bar { X } }$, but control limits for the range are not symmetrical around $\bar { R }$; they are typically one-sided, with a lower limit often being zero.

Control Limits for the Mean Are Symmetrical Around Xˉˉ\bar { \bar { X } }Xˉˉ

Control Limits for the Mean Are Symmetrical Around $\bar { \bar { X } }$