CHM211H5 Lecture Notes - Coefficient Of Variation, Gaussian Function, Standard Deviation
Document Summary
Mean ( ): also known as the average, obtained by dividing the sum of replicate measurements by the number of measurements in the set, given mathematically as. N i x where xi represents the individual values of x making up the set of n replicate measurements. Median: middle result of replicate data when arranged in ascending or descending order, there should exist an equal number of results above and below the median value. If working with an even-numbered data set, the median can be evaluated as the mean of the middle pair of results. Ideally, the mean and the median should be identical. Evaluation of analytical data describes the reproducibility of measurements. The relative error, er, in a measurement is given as: Figure adapted from: fundamentals of analytical chemistry, 8th edition, skoog, west, holler and crouch, eds. , nelson (toronto) 2004, p. 93. Random error (indeterminant error) causes data to scatter symmetrically about the mean value. affects precision.
