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qualitycontrol-138
QC CHART DEFINITIONS — The text defines SHIFT in the context of quality control charts. What is a SHIFT in QC chart terms?
A. A gradual progressive change in control values over time
B. THE SITUATION WHERE CONTROL VALUES SUDDENLY MOVE FROM CLUSTERING AROUND THE MEAN LINE TO A LINE ABOVE OR BELOW THE MEDIAN — a sudden systematic change
C. A single outlier value beyond ±3SD
D. Increased scatter of values around the mean
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