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Control chart with multiple samples

Control chart with multiple samples

Control chart with multiple samples

(OP)
I have sample groups that include anywhere from 1 to 3 individual samples. How would one set up a control chart using excel for this situation? Would I have to calculate the control chart constant for each sample group, and enter that into a control chart? I currently am doing it based on the average of 2, but want to be sure I am accurate.

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