Book excerpt: This book has been written to provide a friendly introduction to data analysis and statistical modelling. It covers all the material in a standard introductory course at university, as well as more advanced topics such as multiple logistic regression. This fourth edition brings new presentations of key topics, such as study design and sampling variability. It includes a new section on power analysis, as well as smaller sections on scientific hypotheses, information theory, and maximum likelihood estimation. This special edition also aims to be ultra portable so that it can be easily carried to classes and to parties, as well as making handy bedtime reading.