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Multiple Choice

Which Westguard rule is listed as indicating a random (precision-based) error?

Random (precision-based) error shows up as scatter in the control results rather than a consistent shift in the mean. The rule represented by this choice targets that scatter within a single run, flagging when the results spread in a way that reveals imprecision rather than a steady bias. It’s the pattern among Westgard rules that best signals random variation in measurement, not a sustained shift. Think of imprecision as results bouncing around the true value without settling toward a single offset. Other rules tend to flag a consistent shift or trend in one direction (bias) or an abrupt change between adjacent results.

Random (precision-based) error shows up as scatter in the control results rather than a consistent shift in the mean. The rule represented by this choice targets that scatter within a single run, flagging when the results spread in a way that reveals imprecision rather than a steady bias. It’s the pattern among Westgard rules that best signals random variation in measurement, not a sustained shift.

Think of imprecision as results bouncing around the true value without settling toward a single offset. Other rules tend to flag a consistent shift or trend in one direction (bias) or an abrupt change between adjacent results.