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

Statistics is one of the most practical and essential courses that you will take, and a primary goal of this popular text is to make the task of learning statistics as simple as possible. Straightforward instruction, built-in learning aids, and real-world examples have made STATISTICS FOR THE BEHAVIORAL SCIENCES, 10th Edition the text selected most often by instructors for their students in the behavioral and social sciences. The authors provide a conceptual context that makes it easier to learn formulas and procedures, explaining why procedures were developed and when they should be used. This text will also instill the basic principles of objectivity and logic that are essential for science and valuable in everyday life, making it a useful reference long after you complete the course.

Statistics is one of the most practical and essential courses that you will take, and a primary goal of this popular text is to make the task of learning statistics as simple as possible. Straightforward instruction, built-in learning aids, and real-world examples have made STATISTICS FOR THE BEHAVIORAL SCIENCES, 10th Edition the text selected most often by instructors for their students in the behavioral and social sciences. The authors provide a conceptual context that makes it easier to learn formulas and procedures, explaining why procedures were developed and when they should be used. This text will also instill the basic principles of objectivity and logic that are essential for science and valuable in everyday life, making it a useful reference long after you complete the course.

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viii

CONTENTS

Summary 219

Focus on Problem Solving 219

Demonstration 7.1 220

Problems 221

CHAPTER 8 Introduction to Hypothesis Testing 223

PREVIEW 224

8.1 The Logic of Hypothesis Testing 225

8.2 Uncertainty and Errors in Hypothesis Testing 236

8.3 More about Hypothesis Tests 240

8.4 Directional (One-Tailed) Hypothesis Tests 245

8.5 Concerns about Hypothesis Testing: Measuring Effect Size 250

8.6 Statistical Power 254

Summary 260

Focus on Problem Solving 261

Demonstration 8.1 262

Demonstration 8.2 263

Problems 263

CHAPTER 9 Introduction to the t Statistic 267

PREVIEW 268

9.1 The t Statistic: An Alternative to z 268

9.2 Hypothesis Tests with the t Statistic 274

9.3 Measuring Effect Size for the t Statistic 279

9.4 Directional Hypotheses and One-Tailed Tests 288

Summary 291

Focus on Problem Solving 293

Demonstration 9.1 293

Demonstration 9.2 294

Problems 295

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