Statistics for the Behavioral Sciences by Frederick J. Gravetter, Larry B. Wallnau ISBN 10: 1305504917 ISBN 13: 9781305504912

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CONTENTS
CHAPTER 3 Central Tendency 67
PREVIEW 68
3.1 Overview 68
3.2 The Mean 70
3.3 The Median 79
3.4 The Mode 83
3.5 Selecting a Measure of Central Tendency 86
3.6 Central Tendency and the Shape of the Distribution 92
Summary 94
Focus on Problem Solving 95
Demonstration 3.1 96
Problems 96
CHAPTER 4 Variability 99
PREVIEW 100
4.1 Introduction to Variability 101
4.2 Defining Standard Deviation and Variance 103
4.3 Measuring Variance and Standard Deviation for a Population 108
4.4 Measuring Standard Deviation and Variance for a Sample 111
4.5 Sample Variance as an Unbiased Statistic 117
4.6 More about Variance and Standard Deviation 119
Summary 125
Focus on Problem Solving 127
Demonstration 4.1 128
Problems 128
CHAPTER 5
z-Scores: Location of Scores
and Standardized Distributions 131
PREVIEW 132
5.1 Introduction to z-Scores 133
5.2 z-Scores and Locations in a Distribution 135
5.3 Other Relationships Between z, X, μ, and σ 138