This is the first international edition of a successful textbook with an outstanding pedigree. It covers a wide range of statistical theory commonly taught in faculties worldwide. This theory is followed by relevant formulae, which are fully supported by solved numerical problems. However no advanced knowledge of mathematics is required. The content is divided into 24 chapters, with problems and exercises to be tackled using SPSS. Two chapters - Research Processes and Experimental Research Designs - ensure that the book can be used in its entirety as a course text, but it is equally valuable to academics and students as a reference work to be consulted on a chapter by chapter basis.