Statistics is the science of making effective apply of mathematical data associating to groups of individuals or experiments. It deals with each aspects of this, including not only the collection, analysis and interpretation of such data, but also the planning of the accumulation of data, in conditions of the design of surveys and experimentations

A Basic destination for a statistical scientific research is to investigate causality, and in detail to draw a conclusion on the result of modifications in the values of predictors or independent variables on dependent variables or response. There are 2 major characters of causal statistical studies: experimental analyses and observational studies. In both characters of studies, the effect of differences of an experimental variable on the behavior of the dependent variable are observed.

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