This chapter outlines the roles and practices that nursing practitioners undertake and the reviews of their basic concepts in their practitioners roles. This includes different practices from research and findings designed from their statistics. It outlines full range types of variables, and the criteria used in the study, scales of measurement and different modeling techniques used during the analysis. The chapter provides an extensive and full range of primary statistical reviews from various fields of non-experimental and experimental analysis views from research findings carried out in relations to the differences in research articles regarding the descriptive and inferential analyses. Conclusively, it outlines the primary basic concepts highlighted in hypothesis that has been carried out during research analysis and testing.