Now in its Third Edition, this text teaches an often intimidating and difficult subject in a way that is informative, personable, and clear. Key Features of the Third Edition include: - A Companion Web Site geared towards helping students to make the most of the text - A dynamic and much expanded suite of Instructor′s Resources - Updated examples from a variety of disciplines, and more of them than ever before - More Time to Practice exercises, with answers in the back of the book - Additional coverage of general research methods basics - Expanded coverage of power