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Consider someone firing a rifle at a target. If their shots centre around the bullseye, they were accurate, even if the scatter is quite large. If the scatter is very small (i.e. all the shots are very clustered) they were very precise - even if that cluster is far from the bullseye. So accuracy: how on target are you. Precision: How much spread is there around the target?
That might be an exponent.
One is a small sample size, but that's just my answer, you might want to ask more people.
Well, one way is no two dollars have the same serial number.Real ones have small red and blue threads embedded in the paper.And most fake ones just don't look real. The printing is sloppy and not crisp.And if you compare them with every little detail you might know of something is different or not.
when there is only small amount