Page 7 - Statistics presented by Dr. Sara Ismail Aborass
P. 7
9/8/2023
Precision – Accuracy
Accuracy is the degree of "trueness" or the closeness of the
analytical result to the "true" value.
The closer a system's measurements to the accepted value, the
more accurate the system is considered to be.
Ex The test result may be a mean of several values. An
accurate determination produces a "true" quantitative
value.
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Precision – Accuracy
Precision is the degree of reproducibility or the closeness of
the results of replicate analyses of the same sample.
It is a measure of dispersion or scattering around the mean
value and usually expressed in terms of standard deviation
or a range (difference between the highest and the lowest
result).
The measurements could be precise, though not necessarily
accurate.
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