Quote:
Originally Posted by devellis
The "accurate" and "precise" concept refer to bias and consistency (or validity and reliability). An unbiased (accurate) device gives a correct value on average. A precise device gives highly consistent values.
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This explanation is spot on. In the OP's diagram "bias" is demonstrated in the top left diagram by showing all hits to the NW of the target. However, in the accurate diagram (top right) they are randomly scattered around the target. Precision, on the other hand, is repeatability.