Accuracy
A measure of how close a measured value is to the true or accepted value of a physical quantity. Accuracy reflects the degree to which a measurement matches reality, independent of precision. High accuracy means a small systematic error; low accuracy indicates the measurement is far from the true value.
Real World
A bathroom scale that always reads 2 kg too high gives precise readings (consistent each time you step on) but inaccurate ones — your GP's calibrated medical scales give the accurate value closer to truth.
Exam Focus
Define accuracy as closeness to the true value, not closeness of repeated readings — confusing accuracy with precision loses marks.
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