Handbook of Statistics: Step by Step Mathematical Solutions is a pedagogical guide that provides a practical review of the most commonly used statistical models in the social sciences. The mathematical procedures are explained step by step, allowing the reader to apply them to solve real world problems in scientific and professional contexts, facilitate objective evidence based decision making, and support original research in behavioral and health sciences. The book features a functional design intended to help students master statistics without prior mathematical background. It also provides illustrated instructions for using JAMOVI, an open source software for data analysis, making it a comprehensive resource for university students in communication, behavioral sciences, business, and humanities.