Duplicates in quality control are used to assess which aspect of data quality?

Duplicates in quality control are used to assess which aspect of data quality?

• A. Precision
• B. Accuracy
• C. Sensitivity
• D. Specificity

Answer: (A)

Duplicated measurements in quality control show how consistently the measurement system reproduces the same result for the same sample. This is about precision—how tightly the repeated results cluster. If the duplicates are very similar, precision is high; if they vary a lot, precision is low. This does not by itself tell you how close you are to the true value (accuracy), which would require comparing to a known standard. Sensitivity and specificity relate to detecting a true condition, not to the repeatability of measurements. In practice you’d quantify precision with the spread of duplicates, such as the standard deviation or coefficient of variation, and compare it to acceptable thresholds.

Duplicated measurements in quality control show how consistently the measurement system reproduces the same result for the same sample. This is about precision—how tightly the repeated results cluster. If the duplicates are very similar, precision is high; if they vary a lot, precision is low. This does not by itself tell you how close you are to the true value (accuracy), which would require comparing to a known standard. Sensitivity and specificity relate to detecting a true condition, not to the repeatability of measurements. In practice you’d quantify precision with the spread of duplicates, such as the standard deviation or coefficient of variation, and compare it to acceptable thresholds.