The biostatistical book currently describes the statistical tests applied in nursing research from the basic level to the higher level. It intends to help the nurse researcher and graduate students involves in research during their last phases of dissertation in doctoral programs. Variables, hypotheses, and research questions are fundamental paradigms in the scope of biostatistics and research, subsequently in the advanced field of nursing sciences and public health. This book directs you into the core of these fundamental paradigms and explicit the assumptions, the designed tests, the formula used, the interpretation of these tests, the degree of inferential of each level, and especially the practical significance level which is beyond the significance level of your statistical outcomes. From simple descriptive tests to the inferential and from 1st degree of inferential to the 8th degree of inferential will open a window of understanding variable, statistical tests with their practical significance on the events. This book is a designed piece of knowledge to impulse, reinforce, and galvanize your expertise in biostatistics and research at the advanced level