Flatirons Surveying has a great page that describes the difference between accuracy and precision.

Precision: the degree of refinement in the performance of an operation, or the degree of perfection in the instruments and methods used to obtain a result. An indication of the uniformity or reproducibility of a result. Precision relates to the quality of an operation by which a result is obtained, and is distinguished from accuracy, which relates to the quality of the result. ...

Accuracy: the degree of conformity with a standard (the "truth"). Accuracy relates to the quality of a result, and is distinguished from precision, which relates to the quality of the operation by which the result is obtained.

So precision tells you how good your method is, and accuracy tells you how good your measurement is. As Yiding Wang is quoted at the top of the page, "Accuracy is telling the truth . . . Precision is telling the same story over and over again."

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