This teacher resource guide provides mathematics teachers with a comprehensive, informal introduction to data analysis and its applications, drawing on classical and contemporary perspectives of statistics. The material is developed in a conversational style through a range of sample contexts, and will provide teachers of secondary mathematics with a practical insight into the key ideas and processes of data analysis. The approach includes the active use of technology with real data to support exploratory, descriptive, and inferential aspects of statistics. In particular, the book will be a valuable reference and resource for teachers of courses that include substantial data analysis. The content covers key statistical concepts, issues in statistics, uni-variate and bi-variate categorical and numerical data, data transformation, and writing a statistical report, with related student activities and solution notes for each chapter.