This unit studies the techniques needed to work effectively with experimental data and their statistical interpretation. It is especially important in practical work, since the chemist’s work often involves conducting experiments – either in the laboratory, or theoretically on a computer. The resulting experiments usually represent large sets of data, in which the values ​​of a given quantity are depending on another (for example, the outside temperature depends on the time when it is measured), which need to be interpreted and presented graphically.