X-MR Control Chart Construction Rules
Studying Six Sigma? Learn the X-MR control chart construction rules here. 1. The data must be continuous.
2. The sample size is 1 and cannot vary.
3. Collect the data in a consecutive manner. (In production order)
4. For the first chart on a process, collect at least 20–25 sample groups to ensure that an adequate measure of process variation has been taken.
5. Calculate the data points to be plotted on the chart.