Precision and Accuracy in a Cleaning Process?

摘要

At Some Point during my studies, the terms precision and accuracy were introduced. I recall the illustration in the textbook that differentiated very simply between the two. The image displayed two targets with bull's-eyes and arrows inserted. The first target demonstrated precision, with all arrows striking the same point of the target, but no arrows reaching the coveted bull's-eye, thus equating precision to repeatability. The second target demonstrated accuracy by having one arrow striking the bull's-eye. In this case, no two arrows arrived at the same point on the target, thereby representing some degree of accuracy (poor in this example) and no repeatability or precision.