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Accuracy represents how close a measurement comesto its true value. This is important because bad equipment,poor data processing or human error can lead to inaccurate resultsthat are not very close to the truth. Precision is how closea series of measurements of the same thing are to eachother.
Besides, what is precise measurement?
Accuracy and Precision: Accuracy refers to thecloseness of a measured value to a standard or known value.Precision refers to the closeness of two or moremeasurements to each other. Using the example above, if youweigh a given substance five times, and get 3.2 kg each time, thenyour measurement is very precise.
Beside above, is a precise measurement always accurate?
Measurements that are close to the known valueare said to be accurate, whereas measurements thatare close to each other are said to be precise. It ispossible to be accurate but not precise, orprecise but not accurate. Ideally,measurements should be both accurate andprecise.
Error is the difference between the true value ofthe measurand and the measured value. Accuracy is anexpression of the lack of error. Uncertainty characterizesthe range of values within which the true value is asserted to liewith some level of confidence.