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qualitycontrol-146
WESTGARD RULES — REJECTION RULE 4₁s detects which type of error and what is its definition?
A. Four consecutive observations all beyond ±2SD — significant random error
B. Four consecutive observations all beyond ±3SD — random error
C. FOUR CONSECUTIVE CONTROL OBSERVATIONS ALL EXCEEDING MEAN + 1SD OR ALL EXCEEDING MEAN − 1SD — indicates SIGNIFICANT SYSTEMATIC ERROR
D. Four consecutive observations alternating above and below the mean
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