The precision limits of a method are defined by:
a. The mean
b. The SD
c. Sensitivity
d. Specificity
ANS: B
Evaluating the same specimen multiple times and applying statistics to the results determine precision or reproducibility. The SD describes the precision. The mean is the average result (assuming a gaussian distribution). Sensitivity describes how well a test identifies positive patients, whereas specificity is how well it identifies only positive patients.
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