Essentials of Statistics for The Behavioral Sciences

Key differences between 9th and 8th editions

• Period between current and previous editions: 4 years (2017 vs 2013).
• Gravetter & Wallnau Essentials of Statistics was first published in 1999.
• Many chapters in the The Ninth edition have been shortened and simplified.
• All sections in the text begin with a list of Learning Objectives and end with a Learning Check questions.
• Ninth Edition provides updated research examples, fresh real-world examples, and extensively revised end-of-chapter problems.
• Chapter 4 has separate section on proof of unbiasedness of sample variance.
• Chapter 5 includes new section in on other relationships between z-Scores, X, the mean, and standard deviation.
• New section in Chapter 11 compares repeated-measures design vs independent-measures design.
• Chapter 13 explains repeated-measures and two-factor analysis of variance in more details.