The latest edition of this best-selling biostatistics text is both comprehensive and easy to read. It provides a broad and practical overview of the statistical analysis methods used by researchers to collect, summarize, analyze, and draw conclusions from biological research data. The Fourth Edition can serve as either an introduction to the discipline for beginning students or a comprehensive procedural reference for today's practitioners. Presents a broad collection of data-analysis procedures and techniques used across a wide variety of biological disciplines. Offers the most comprehensive treatment available, including coverage of unique topics. Adopts an approach that is both readable and accessible, assuming no previous statistics background or mathematical expertise beyond simple algebra. Considers factorial analysis of variance and multiple regression in terms of the interpretation of typical computer output.