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WESTGARD MULTIRULE CHARTS — What does the WARNING RULE 1₂s indicate in Westgard multirule interpretation?
A. One control observation exceeding mean ± 3SD — rejection of run
B. ONE CONTROL OBSERVATION EXCEEDING THE MEAN ± 2S — indication of RANDOM ERROR; triggers further rule checking but does NOT alone cause rejection
C. Two consecutive observations both beyond mean + 2SD or both beyond mean − 2SD
D. Four consecutive observations all beyond mean + 1SD
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