Statistical Methods for Psychology surveys the statistical techniques commonly used in the behavioural and social sciences, especially psychology and education. To help students gain a better understanding of the specific statistical hypothesis tests that are covered throughout the text, the author emphasises conceptual understanding. Along with a significantly updated discussion of effect sizes and examples on how to write up the results of data analysis, this edition continues to focus students on two key themes: the importance of looking at the data before beginning a hypothesis test, and the importance of knowing the relationship between the statistical test in use and the theoretical questions being asked by the experiment.