Absolute Error
المؤلف:
D. A. Skoog, F. J.Holler, D M. West, and S. R. Crouch
المصدر:
Fundamentals of Analytical Chemistry
الجزء والصفحة:
9th ed - p85
24-8-2016
2232
Absolute Error
The absolute error E in the measurement of a quantity x is given by the equation
where xt is the true or accepted value of the quantity. Returning to the data displayed in Figure 1-1, the absolute error of the result immediately to the left of the true value of 20.0 ppm is 20.2 ppm Fe; the result at 20.1 ppm is in error by 10.1 ppm Fe.
Figure 1-1 Results from six replicate determinations of iron in aqueous samples of a standard solution containing 20.0 ppm iron(III). The mean value of 19.78 has been rounded to 19.8 ppm
Note that we keep the sign in stating the error. The negative sign in the first case shows that the experimental result is smaller than the accepted value, and the positive sign in the second case shows that the experimental result is larger than the accepted value.
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