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MethodologySix Sigma

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.

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