Developing Moving Ranges Control Charts

How can we develop Moving Ranges Control Charts?

We can develop the Moving Range Control Chart as follows:
1. Calculate the moving ranges:. Plot these moving ranges on your chart
2. Calculate the mean of the moving ranges. Plot this on the chart.
3. Multiply the mean with 3.268. Plot this as the Upper Control Line (UCL). This Line is 3 standard
deviations above the line
4. to determine whether the process metrics description is stable, a simple question Is asked: are the moving
ranges values inside the UCL? If the answer is yes then The process is stable otherwise it is unstable