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A positive aspect of Shewhart charts is using control chart limits to avoid tampering with a process in a state of control. Includes a discussion of the rationale for using three as the multiplier of the standard deviation when setting control chart limits.
A positive aspect of Shewhart charts is using control chart limits to avoid tampering with a process in a state of control. Includes a discussion of the rationale for using three as the multiplier of the standard deviation when setting control chart limits.