In Australia,control limits on a control chart are placed so that they are three standard deviations above and below a central line.

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This is a common practice in statistical process control and is known as the "3-sigma rule." By placing the control limits at three standard deviations above and below the central line, it is expected that only 0.27% of the data points will fall outside these limits if the process is in control. This provides a way to quickly identify when the process may be out of control and needs further investigation or intervention.

In Australia,control Limits on a Control Chart Are Placed So