Statistics in Psychology covers all statistical methods needed in education and research in psychology. This book looks at research questions when planning data sampling, that is to design the intended study and to calculate the sample sizes in advance. In other words, no analysis applies if the minimum size is not determined in order to fulfil certain precision requirements. The book looks at the process of empirical research into the following seven stages: Formulation of the problem Stipulation of the precision requirements Selecting the statistical model for the planning and analysis The (optimal) design of the experiment or survey Performing the experiment or the survey Statistical analysis of the observed results Interpretation of the results. Statistics in Psychology presents the statistical methods needed for education and research in psychology. This book explores the process of empirical research in the following seven stages: formulation of the problem, stipulation of the precision requirements, selecting the statistical model for the planning and analysis, the (optimal) design of the experiment or survey, performing the experiment or the survey, statistical analysis and the interpretation of the observed results. Key features: Explores solutions to real life problems by using software packages R and SPSS, whilst keeping formulae to a minimum. Addresses simple statistics along with univariate and multivariate methods and experimental design, such as accurate calculation of sample sizes. Discusses and uses results on characteristics of statistical test procedures Is supported by an accompanying website featuring R and SPSS. The authors address both basic and advanced levels. Students of psychology will find this book useful, as well as researchers and students in the social and behavioural sciences.