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WESTGARD RULES — What does the REJECTION RULE R₄s indicate and what type of error does it detect?
A. R₄s: four consecutive observations beyond ±1SD — systematic error
B. R₄s: ONE OBSERVATION EXCEEDING MEAN + 2SD AND ANOTHER EXCEEDING MEAN − 2SD IN THE SAME ANALYTICAL RUN — range between these two exceeds 4SD; indicates SIGNIFICANT RANDOM ERROR
C. R₄s: ten consecutive observations on one side of mean
D. R₄s: two consecutive observations both beyond ±3SD
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