In the context of protein measurement methods, which of the following best describes the difference between accuracy and precision?

Accuracy is how close a protein measurement is to the true value, while precision is how consistently the method gives the same result when repeated. In a protein assay, an accurate test would give a value near the real protein concentration, but a precise test would give the same reading each time even if that value is wrong. For example, if the true protein concentration is 10 µg/mL, an accurate measurement would read about 10 µg/mL, whereas a precise measurement would produce the same value—say 12 µg/mL—every time it is performed. Thus accuracy reflects correctness, while precision reflects repeatability.