| Introduction | p. 1 |
| Experimental Psychology and the Scientific Method | p. 2 |
| The Need for Scientific Methodology | p. 4 |
| The Characteristics of Modern Science | p. 9 |
| The Tools of Psychological Science | p. 15 |
| Scientific Explanation in Psychological Science | p. 19 |
| The Organization of the Text | p. 22 |
| Summary | p. 23 |
| Key Terms | p. 24 |
| Review and Study Questions | p. 25 |
| Critical Thinking Exercise | p. 26 |
| Online Resources | p. 26 |
| Research Ethics | p. 27 |
| Research Ethics | p. 28 |
| The American Psychological Association Guidelines | p. 31 |
| Protecting the Welfare of Animal Subjects | p. 38 |
| Fraud in Science | p. 46 |
| Plagiarism | p. 48 |
| Summary | p. 49 |
| Key Terms | p. 50 |
| Review and Study Questions | p. 51 |
| Critical Thinking Exercise | p. 52 |
| Online Resources | p. 52 |
| Alternatives to Experimentation: Nonexperimental Designs | p. 53 |
| Describing Research Activities | p. 55 |
| Nonexperimental Approaches | p. 56 |
| Sampling | p. 75 |
| Summary | p. 82 |
| Key Terms | p. 83 |
| Review and Study Questions | p. 85 |
| Critical Thinking Exercise | p. 86 |
| Online Resources | p. 86 |
| Alternatives to Experimentation: Correlational and Quasi-Experimental Designs | p. 87 |
| Correlational Designs | p. 90 |
| Quasi-Experimental Designs | p. 102 |
| Summary | p. 113 |
| Key Terms | p. 114 |
| Review and Study Questions | p. 115 |
| Critical Thinking Exercise | p. 116 |
| Online Resources | p. 116 |
| Formulating the Hypothesis | p. 117 |
| The Characteristics of an Experimental Hypothesis | p. 119 |
| The Inductive Model | p. 123 |
| The Deductive Model | p. 124 |
| Combining Induction and Deduction | p. 125 |
| Building on Prior Research | p. 126 |
| Serendipity and the Windfall Hypothesis | p. 127 |
| Intuition | p. 128 |
| When All Else Fails | p. 131 |
| Searching the Research Literature | p. 132 |
| Summary | p. 136 |
| Key Terms | p. 137 |
| Review and Study Questions | p. 137 |
| Critical Thinking Exercise | p. 138 |
| Online Resources | p. 139 |
| Method | p. 141 |
| The Basics of Experimentation | p. 142 |
| Independent and Dependent Variables | p. 144 |
| Operational Definitions | p. 151 |
| Evaluating Operational Definitions | p. 161 |
| Evaluating the Experiment: Internal Validity | p. 168 |
| Planning the Method Section | p. 178 |
| Summary | p. 181 |
| Key Terms | p. 182 |
| Review and Study Questions | p. 184 |
| Critical Thinking Exercise | p. 185 |
| Online Resources | p. 185 |
| Solving Problems: Controlling Extraneous Variables | p. 186 |
| Physical Variables | p. 187 |
| Social Variables | p. 191 |
| Personality Variables | p. 203 |
| Context Variables | p. 206 |
| Summary | p. 208 |
| Key Terms | p. 209 |
| Review and Study Questions | p. 210 |
| Critical Thinking Exercise | p. 211 |
| Online Resources | p. 211 |
| Basic Between-Subjects Designs | p. 212 |
| Selecting and Recruiting Subjects | p. 214 |
| One Independent Variable: Two-Group Designs | p. 217 |
| Two Independent Groups | p. 218 |
| Two Matched Groups | p. 229 |
| Multiple Groups | p. 233 |
| Summary | p. 239 |
| Key Terms | p. 241 |
| Review and Study Questions | p. 242 |
| Critical Thinking Exercise | p. 243 |
| Online Resources | p. 243 |
| Between-Subjects Factorial Designs | p. 244 |
| More Than One Independent Variable | p. 245 |
| Laying Out a Factorial Design | p. 248 |
| A Research Example | p. 253 |
| Choosing a Between-Subjects Design | p. 259 |
| Summary | p. 264 |
| Key Terms | p. 265 |
| Review and Study Questions | p. 265 |
| Critical Thinking Exercise | p. 266 |
| Online Resources | p. 266 |
| Within-Subjects Designs | p. 267 |
| A Within-Subjects Experiment: Perceptual Bias for Forward Motion | p. 270 |
| Within-Subjects Factorial Designs | p. 272 |
| Mixed Designs | p. 273 |
| Advantages of Within-Subjects Designs | p. 274 |
| Disadvantages of Within-Subjects Designs | p. 276 |
| Controlling Within-Subjects Designs | p. 278 |
| How Can You Choose a Design? | p. 291 |
| Summary | p. 292 |
| Key Terms | p. 293 |
| Review and Study Questions | p. 294 |
| Critical Thinking Exercise | p. 296 |
| Online Resources | p. 296 |
| Within-Subjects Designs: Small N | p. 297 |
| Small N Designs | p. 298 |
| ABA Designs | p. 303 |
| Multiple-Baseline Design | p. 309 |
| Discrete Trials Designs | p. 311 |
| When to Use Large N and Small N Designs | p. 312 |
| Summary | p. 315 |
| Key Terms | p. 316 |
| Review and Study Questions | p. 317 |
| Critical Thinking Exercise | p. 318 |
| Online Resources | p. 318 |
| Results: Coping With Data | p. 319 |
| Why We Need Statistics | p. 320 |
| Weighing the Evidence | p. 322 |
| Statistical Inference: An Overview | p. 323 |
| Applying Statistical Inference: An Example | p. 330 |
| The Odds of Finding Significance | p. 339 |
| Test Statistics | p. 344 |
| Organizing and Summarizing Data | p. 345 |
| Summary | p. 354 |
| Key Terms | p. 355 |
| Review and Study Questions | p. 357 |
| Critical Thinking Exercise | p. 358 |
| Online Resources | p. 358 |
| Analyzing Results: Two Group Examples | p. 359 |
| Which Test Do I Use? | p. 360 |
| The Chi Square Test | p. 363 |
| The t Test | p. 368 |
| Summary | p. 382 |
| Key Terms | p. 383 |
| Review and Study Questions | p. 383 |
| Critical Thinking Exercise | p. 386 |
| Online Resources | p. 386 |
| Analyzing Results: Multiple-Groups and Factorial Experiments | p. 387 |
| Analysis of Variance | p. 388 |
| Sources of Variability | p. 389 |
| A One-Way Between-Subjects Analysis of Variance | p. 392 |
| One-Way Repeated Measures Analysis of Variance | p. 405 |
| Analyzing Data from a Between-Subjects Factorial Experiment | p. 405 |
| A Two-Way Analysis of Variance | p. 408 |
| Repeated Measures and Mixed Factorial Designs | p. 419 |
| Summary | p. 421 |
| Key Terms | p. 422 |
| Review and Study Questions | p. 423 |
| Critical Thinking Exercise | p. 426 |
| Online Resources | p. 426 |
| Discussion | p. 427 |
| Drawing Conclusions: The Search for the Elusive Bottom Line | p. 428 |
| Evaluating the Experiment from the Inside: Internal Validity | p. 430 |
| Taking a Broader Perspective: The Problem of External Validity | p. 435 |
| Handling a Nonsignificant Outcome | p. 445 |
| Summary | p. 449 |
| Key Terms | p. 450 |
| Review and Study Questions | p. 450 |
| Critical Thinking Exercise | p. 452 |
| Online Resources | p. 452 |
| Writing the Research Report | p. 453 |
| The Written Report: Purpose and Format | p. 454 |
| Major Sections | p. 456 |
| Looking at a Journal Article | p. 464 |
| Preparing Your Manuscript: Procedural Details | p. 478 |
| Making Revisions | p. 481 |
| Summary | p. 484 |
| Key Terms | p. 484 |
| Review and Study Questions | p. 485 |
| Critical Thinking Exercise | p. 486 |
| Online Resources | p. 487 |
| Appendices | |
| Computational Formulas | p. 489 |
| Statistical Tables | p. 495 |
| A Journal Article in Manuscript Form | p. 505 |
| Glossary | p. 531 |
| References | p. 545 |
| Index | p. 555 |
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