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difference between accuracy and precision by image

Precision and accuracy

Comparing precision and accuracy: a dart board analogy

The accuracy and precision of darts hitting a dart board illustrate the ways that data can be precise and/or accurate.
(a) The darts are both scattered (low precision) and off-center (low accuracy). 
(b) The darts are in a tight cluster (high precision) but still off-center (low accuracy). 
(c) The darts are somewhat scattered (low precision) but evenly distributed about the center (high accuracy).

precision, accuracy, measurements, data, dart
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