Control limits are chosen statistically so that there is a high probability that sample statistics will fall randomly between the lower control limit and the upper control limit if the process is in control.

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Control limits are specifically designed to indicate the range within which a process variable is expected to fluctuate in a state of statistical control, which means that variations in the process are due to common causes of variation only. Therefore, it is expected that sample statistics will fall randomly between the lower and upper control limits if the process is in control.

Control Limits Are Chosen Statistically So That There Is a High