2/13/2023 0 Comments Accurate standard deviation![]() We often speak of accuracy in qualitative terms such a "good," "expected," "poor," and so on. We can then define the error in relation to the true value and the measured value according to the following equation: For example, lets call a measurement we make X I and give the symbol µ for the true value. However, we must add the reality of error to our understanding. Our inability to perform perfect measurements and thereby determine true values does not mean that we have to give up the concept of accuracy. Since there is no perfect measurement in analytical chemistry, we can never know the true value. In theory, a true value is that value that would be obtained by a perfect measurement. "closeness of the agreement between the result of a measurement and a true value." The VIM reminds us that accuracy is a "qualitative concept" and that a true value is indeterminate by nature. The International Vocabulary of Basic and General Terms in Metrology (VIM) defines accuracy of measurement as. In analytical chemistry, the term 'accuracy' is used in relation to a chemical measurement.
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