Normality of data, Test of hypotheses, p-value, Parametric tests, Non-parametric tests, Statistical research

Statistical methods have been widely applied in the concrete realizations of researches. A suitable procedure for providing of a significant research is generally based on a complementation of two types of approaches - a qualitative or a quantitative research. In the current researches in a field of education, the quantitative research is principally bound on computations of appropriate statistical methods; however, a modular approach of a software using of these methods can be frequently seen. Implementations and mathematical principles can be hidden and often unknown for some users of software support, because a modern software interface can return results in a comfortable form of p-values. In this paper, a normality testing of data is highlighted and further analyzed with focusing on relations between a normality occurrence and size of population using an example of a practical application of a pedagogical research.