A second chart, the moving range chart, can also be used but only with rules 1, 2, 3 and 4.
2.
As with other control charts, the individuals and moving range charts consist of points plotted with the control limits, or natural process limits.
3.
The " chart " actually consists of a pair of charts : one, the individuals chart, displays the individual measured values; the other, the moving range chart, displays the difference from one point to the next.
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