The book that established itself as a standard text and reference work for students seeking to master research methods and procedures in psychology has been updated and revised in this new edition! The Second Edition of The Psychology Research Handbook: A Guide for Graduate Students and Research Assistants once again offers a comprehensive guide for understanding and conquering the entire research process. Editors Frederick T. L. Leong and James T. Austin have assembled a distinguished group of expert researchers who share skill sets accumulated as a result of years of practical exposure to the design, development, implementation, and documentation of research in psychology.
Chapter 11: Statistical Power
Psychological researchers have become increasingly aware of the importance of designing more powerful studies. In this context, power is a technical term that indicates the sensitivity of statistical significance tests used in the analysis of data. The power of a statistical test is the probability of rejecting the null hypothesis when the alternative hypothesis is true (i.e., when there is a real effect in the population). To put it simply, power is the probability of getting a significant result when you deserve to get one. Assuming you are seeking significant effects, so you will have something to talk about in your discussion, power is the probability that your experiment will work out the way you hope it will. Before power was routinely ...