Introduction to Research Methods and Statistics in Psychology

The 4th edition of this comprehensive text has been thoroughly revised to provide an in-depth survey of research methods and statistical concepts in psychology. It offers clear explanations of both experimental and non-experimental designs, with a focus on various threats to internal and external validity. Key topics such as quasi-experiments, cross-cultural issues, ethics, and the quantitative-qualitative debate are explored in detail. The statistical procedures covered range from nominal level tests to multi-factorial ANOVA designs and multiple regression, ensuring comprehensive coverage for all levels of study. New features include log linear analysis and an in-depth look at effect size and power, allowing students to easily report the power of their findings. Additionally, this edition includes illustrated SPSS instructions for all statistical procedures, covering data entry and output interpretation, thus removing the need for a separate SPSS textbook. Each chapter features a self-test glossary, key terms, and exercises, along with guidance on study planning, data analysis, and report writing. A marked report and a complete published qualitative report are included, as well as advice on reporting results in APA style for each statistical test. This bestselling text remains essential for psychology students and related disciplines.