The ninth edition of Experimental Methodology presents a reader-friendly introduction to the basic principles of experimental and non-experimental psychological research. This text is organized so that each chapter focuses on a specific step in the research process. It provides an instruction in the experimental research and an introduction to non-experimental approaches such as ex-post facto research, correlational research, and survey research. Highlights of the Ninth Edition: Incorporates both quantitative and qualitative research to give students a balanced perspective. Chapter-opening vignettes focus on current events to demonstrate the real-life relevance of psychological research. A Visual Overview at the beginning of each chapter provides an engaging preview. Survey research is provided to bring more of a real life aspect to the text. Incorporates the new APA code of ethics as it pertains to research. New end of chapter mini-quizzes help students review material.Christensen, Larry B. is the author of 'Experimental Methodology' with ISBN 9780205393695 and ISBN 0205393691.