Answer
Accuracy is nearness to a target value for measurements or data. Let's say the central target of a bullseye.
Precision is the repeatability of a measurement or data. That is doing the same thing in the same way.
Some illustrations: A gun that shoots close to the bullseye is accurate. A gun that shoots a tight grouping is precise.
Now, a tight grouping of shots around the bullseye is both accurate and precise. But a tight grouping far from the bullseye is far preferable to a loose grouping centered around the bulleye--because the precise data can be corrected whereas the inaccurate data cannot be (although it can be averaged).
This distinction is only about the meaning of words and is an issue of vocabulary. Real engineers and physicists understand this but don't spend any time discussing it.
Note to teachers and students: My vision of Hell--definitions of "stalagmite and stalactite"; "accuracy and precision"; "revolve and rotate", then unit conversion questions of inches and feet and furlongs. Thus the students' heads will be full of stuff that is absolutely worthless.
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austins grandma
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austins grandma
First answer by ID1214100365. Last edit by Eric M Jones. Contributor trust: 392 [recommend contributor]. Question popularity: 13 [recommend question]
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