For process control charts,to approximately capture 99% of the random variation,the control limits will correspond to z = 3 standard deviations from the mean.

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In process control charts, setting the control limits at 3 standard deviations from the mean (z = 3) is a common practice to capture approximately 99.73% of the random variation under a normal distribution, effectively identifying potential signals or outliers.

For Process Control Charts,to Approximately Capture 99% of the Random