Computational methodsIntelligent systems,Population statistics, Reliability

In the previous contribution, a guarantee of normality property was proved in case of applied pedagogical research. However, an analysis of this confirmed behaviour can be interestingly identified in case of a research with a large scale sample of data. Therefore, an extended analysis is provided in this paper. According to added of reliability indicators, this analysis is performed on dynamical changed population of the whole file of data with random principle of selection of sub-parts of this file for purposes of their analysis. With regards to this variable sample size, the guarantee of the normality and corresponding conclusions about testing considered hypotheses are discussed in this paper with aim to confirm assumed independences of the normality on the sample size. © 2019, Springer Nature Switzerland AG.