This widely acclaimed text is an accessible and comprehensible introduction to the use of statistical tests in psychology experiments: statistics without panic. Presented with a new text design and layout, its key objective is to enable students to select appropriate statistical tests to evaluate the significance of data obtained from psychological experiments. Improvements in the organization of chapters emphasize even more clearly the principle of introducing complex experimental designs on a 'need to know' basis, leaving more space for an extended interpretation of analysis of variance. There is an additional chapter which introduces experimental designs as an example of a relationship between independent and dependent variables. An important development for the third edition is that students are introduced to modern statistical packages as a useful tool for calculations, the emphasis being on understanding and interpretation.