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Word Description
X-Bar & R A standard compound SPC control chart for variable data. The upper chart plots the average of the samples of a subgroup. The lower chart plots the range between the largest and smallest samples within the plotted subgroup.
X-Bar & S A standard compound SPC control chart for variable data. The upper chart plots the average of the samples of a subgroup. The lower chart plots the standard deviation of the samples within the plotted subgroup.

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