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 first of 6 books introduces the basic tenets of statistics, as well as some of the principles of probability, and their relation to how data is gathered, measured and interpreted. Worked out exercises help to clarify the principles explained in the book