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It takes a lot of good, hard-working people to produce a book. Our friends at
Wadsworth/Cengage have made enormous contributions to this textbook. We thank:
Linda Schreiber-Ganster, Publisher/Executive Editor; Timothy Matray, Acquisitions
Editor; Tangelique Williams, Managing Developmental Editor; Kelly Miller, Assistant
Editor; Lauren K. Moody, Editorial Assistant/Associate; Charlene M. Carpentier,
Content Project Manager; Mary Noel, Media Editor; and Pam Galbreath, Art Director.
Special thanks go to Liana Sarkisian, our Development Editor, and to Mike Ederer who
led us through production at Graphic World.
Reviewers play a very important role in the development of a manuscript.
Accordingly, we offer our appreciation to the following colleagues for their assistance
with the ninth edition: Patricia Case, University of Toledo; Kevin David, Northeastern
State University; Adia Garrett, University of Maryland, Baltimore County; Carrie E. Hall,
Miami University; Deletha Hardin, University of Tampa; Angela Heads, Prairie View
A&M University; Roberto Heredia, Texas A&M International University; Alisha
Janowski, University of Central Florida; Matthew Mulvaney, The College at Brockport
(SUNY); Nicholas Von Glahn, California State Polytechnic University, Pomona; and
Ronald Yockey, Fresno State University.
Those of you familiar with the previous edition of Statistics for the Behavioral Sciences
will notice a number of changes in the ninth edition. Throughout the book, research ex-
amples have been updated, real-world examples have been added, and the end-of-
chapter problems have been extensively revised. The book has been separated into five
sections to emphasize the similarities among groups of statistical methods. Each sec-
tion contains two to four chapters, and begins with an introduction and concludes with
a review, including review exercises.
Major revisions for this edition include:
1. The former Chapter 12 on Estimation has been eliminated. In its place, sections
on confidence intervals have been added to the three t-statistic chapters.
2. The former Chapter 20 covering hypothesis tests for ordinal data has been
converted into an appendix.
3. A new final chapter discusses the process of selecting the correct statistics to be
used with different categories of data and replaces the Statistics Organizer,
which appeared as an appendix in earlier editions.
Other examples of specific and noteworthy revisions include:
Chapter 1 A separate section explains how statistical methods can be classified using
the same categories that are used to group data structures and research methods. A new
heading clarifies the concept that different scales of measurement require different
statistical methods.
TO THE INSTRUCTOR
ACKNOWLEDGMENTS
xvi PREFACE