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WESTGARD RULES — What does the REJECTION RULE 1₃s indicate and what type of error does it detect?
A. Two consecutive observations both beyond ±2SD — systematic error
B. ONE CONTROL OBSERVATION EXCEEDING THE MEAN ± 3SD — indication of SIGNIFICANT RANDOM ERROR; analytical run must be REJECTED
C. Four consecutive observations beyond ±1SD — systematic error
D. Ten consecutive observations on one side of mean — systematic error
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