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When data are collected under a variety of different conditions the meaning of the
data can be hard to see. Stratification within a process can lead to hidden underlying
Control chart points are plotted using a symbol and color depending on the
operator. It is easy to see that the operator SNH was responsible when the
out-of-control signals occurred.
After investigating the causes of the out-of-control condition we document
them in the worksheet alongside the data.