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Definition of "Precision" |
Degree of agreement within a group of measurements or instruments. / Precision is usually described in terms of the number of digits used to make a measurement or approximation though it can also be described in terms of the standard deviation of the errors. For example, an amp-meter with a three-digit display is more precise than an amp-meter with a two-digit display. With a 30 cm ruler, you can usually measure the distance of an object down to the closest millimetre, and perhaps even down to a quarter of a millimetre. Such a means of measuring is not as precise as if you were using a micrometer to measure the same distance. Additionally, a poorly calibrated micrometer is still more precise than a 30 cm ruler. / Refinement in a measurement, calculation, or specification, especially as represented by the number of digits given. |
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