The inexcusable confluence of the science of Statistics and the science of Psychology is concretized in this study through the delimitation of the intersection detected and established in approaches, materials and data that are compiled in the historical exposition of both areas of knowledge, with the purpose of channeling and interpreting the historical evolution of both disciplines, thus providing a base of resources to be used for further research.
Psychology turns to Statistics, to the statistical treatment of data, when it begins as a modern science with the objective of satisfying the need to gather parameters in some type of research or investigation with the purpose of clarifying the dependent relationship or not of certain interactions between different dimensions of the studied phenomenon. It is necessary to specify the structure of the functional associations established in both sciences in order to know, identify and clearly distinguish if the interactions recorded are established with qualitative variables or if they are repeated measurements on the same individuals, or if there is certain variability between parametric distributions, etc.
Statistical mathematics intervenes to form and express psychological ideas and hypotheses as precisely as possible; to derive from them, with greater deductive power than verbal reasoning allows and with the maximum guarantee of logical coherence, the observable consequences that follow from these hypotheses; and finally, to strictly and objectively compare the hypothetical predictions with the actual experimental or empirical observations.
In short, we are talking about the emergence of statistics in the history of psychology.