Evelyn Davis & Steven Davis 
Data Analysis with SPSS Software [PDF ebook] 
Variability, Probability, and the Normal Distribution

Building on the tools and techniques found in the popular statistics computer program, SPSS, this series of six books introduces the reader to the concepts of data, their categorical types, how data can be organized and manipulated, and how they can be put to practical use in solving everyday problems in science, business and technology. This second of 6 books introduces the basic principles of probability and various types of probability problems including geometric and hypergeometric probability. It covers the challenges of how to count complex groups and numbers, using things like power series to extrapolate large quantities. The book also introduces the concept and uses of the Normal Distribution as well as the Central Limit Theorem. Worked out exercises help to clarify the principles explained in the book.