Established researchers and first-year graduate psychology students, virtually all of whom are required to take two or three quarters of statistics. This book's goal is to help students develop skills of scientific inferences. To accomplish this, the author has developed the experimental pyramid which summarizes the philosophy of the book. Containing six levels, the pyramid portrays a hierarchy of considerations involved in empirical investigation. Unlike most texts, this one does not place the usual emphasis on null hypothesis testing and it de-emphasizes computational formulas to invest...