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A big problem with the terms 'accurate' and 'precision' is that they have much better definitions and usage when taking actual measurements.

ACCURATE or accuracy is used indicate how well a trial measurement matches a known standard. For example if a high quality 1 inch 'test guage' is measured with calipers or mic and consistently gives reading of 0.999 and 1.001 inches then the measurement tool is accurate to slightly less than plus/minus 0.001 inches.

PRECISION of the tool is how small differences the tool can detect. If the tool measures the 1 inch test guage as 1.05 to 1.08, then the tool's precision only allows it to meausure to 0.01 difference, and doesn't allow it to measure to a 0.001 (or 0.005) difference - and the tools accuracy is not very good.

So PRECISION is how similar the readings are when done mutiple times.
ACCURATE is how near the readings are to the REAL target.

Jay Kosta
Endwell NY USA
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