Fortunately, with a few simple convenient statistical tools most of the information needed in regular laboratory work can be obtained: the ' t-test, the ' F-test', and regression analysis. In analytical work, the most important common operation is the comparison of data, or sets of data, to quantify accuracy (bias) and precision. For the detection itself as well as for the quantification of the errors, statistical treatment of data is indispensable.Ī multitude of different statistical tools is available, some of them simple, some complicated, and often very specific for certain purposes. This can be done by critically looking at the performance of the analysis as a whole and also of the instruments and operators involved in the job. An important aspect of the quality control is the detection of both random and systematic errors. This is the reason why a complex system of precautions to prevent errors and traps to detect them has to be set up. It was stated before that making mistakes in analytical work is unavoidable. Before embarking upon the actual analytical work, however, one more tool for the quality assurance of the work must be dealt with: the statistical operations necessary to control and verify the analytical procedures (Chapter 7) as well as the resulting data (Chapter 8). In the preceding chapters basic elements for the proper execution of analytical work such as personnel, laboratory facilities, equipment, and reagents were discussed. There are lies, damn lies, and statistics.

Software statistica 6