The book consists of six chapters and supplement the statistical tables. Chapter I provides some simple properties of probabilistic distribution of the sign and disparate moments and functions and the regression curve in the second quarter Vihdt book on random sampling, distribution and its relationship to either bring it in the third quarter book provides small sampling distributions. The fourth chapter speaks of the basic principles in the estimate, types and effectiveness of the theories and methods related either in Chapter V provides confidence intervals and type and method of access to and Chapter VI provides the basic principles to test hypotheses and the types of tests and the best and ends each chapter exercises.