Evelyn Davis & Steven Davis 
Data Analysis with SPSS Software [PDF ebook] 
Analysis of Variance

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 fourth of 6 books introduces tools found in the SPSS software to analyzie both normal and multivariate variance. It explains the F-Value and how it used with bar plots. It also explains co-variates and how they are used. Worked out exercises help to clarify the principles explained in the book.