Standard practice in statistical process control for variables is to set control limits so that 95 percent of the sample means will fall within the UCL and the LCL.

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Standard practice in statistical process control for variables is to set control limits so that approximately 99.73 percent of the sample means will fall within the Upper Control Limit (UCL) and the Lower Control Limit (LCL), assuming a normal distribution. This corresponds to ±3 standard deviations from the process mean.

Standard Practice in Statistical Process Control for Variables Is to Set