accuracy, precision

accuracy: the closeness of a measurement to the expected or ‘true’ value; the correctness of a statement

The spectrometer was more accurate after it was calibrated.
His assertion that Earth is flat was inaccurate.

precision: the closeness of measurements to each other (ie the ‘spread’ of the data); the degree of specificity of a measurement

The similarity of the replicates demonstrates the precision of the method.
3.14159 is more precise than 3.1.

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Australian manual of scientific style Start communicating effectively