Gravetter, Frederick J. Statistics for the behavioral sciences / Frederick J Gravetter, Larry B. Wallnau. - 9th ed. - Belmont, CA : Wadsworth Cengage Learning, 2013. - xxi, 767 p. : ill. ; 26 cm. Includes bibliographical references (p. 755-759) and index. ISBN: 9781111830991 (hbk.) RM688.92 1111830991 (hbk.) 9781111835767 (loose-leaf) 1111835764 (loose-leaf) Subjects--Topical Terms: Psychology--Statistical methods.Educational statistics.