Accuracy: It is the; closeness to the true value; closeness with which an instrument reading approaches the true or accepted value of the variable (quantity) being measured.
Accuracy is the degree of closeness between a measurement and its true value. Precision is that the degree to which repeated measurements under the identical conditions show the identical results.
The actual population value that will be obtained with perfect measuring instruments and without committing any error of any type, both in collecting the first data and in ending mathematical operations.
Accuracy is the degree of closeness to true value. Precision is the degree to which an instrument or process will repeat the identical value. In other words, accuracy is the degree of veracity while precision is the degree of reproducibility. For example, the term error, as used here, means the difference between a measured value and therefore the true value for a measurement.
Since the precise or "true" measured value of a quantity can often not be determined, the error in an exceedingly degree of closeness measurement can rarely be determined.
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