Abstract
This chapter presents the methods for estimation of the results of chemical analysis. In chemical analysis a more complicated task often has to be carried out— comparison of two mean results. In some cases in chemical analysis it becomes necessary to compare several variances, thus a method is presented in the chapter to compare variance with the help of an example. In chemical analysis as in any measuring process, some criterion is necessary for estimating sharply separated determinations. The only completely reliable method of revealing gross errors is a detailed analysis of the conditions of the experiment, which enables observations in which the standard conditions of measurement are broken to be excluded. In this case the doubtful measurements are rejected irrespective of their magnitude; for example, if in photometry of lines on a photographic plate it is found that the emulsion in the neighborhood of the given line is damaged, the results of measurements should be rejected even if they do not differ considerably from the entire series of measurements.
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