Probability and Statistical Inference is an applied introduction to the fields of probability and statistics, penned by Robert Hogg, Joseph McKean, and Allen Craig. First published in 2013, this ninth edition offers a comprehensive guide for students with a background in calculus. The book emphasizes the importance of understanding variation in processes through the study of probability and statistical methods. Filled with real-world examples, it illustrates how these concepts can be applied to various scenarios, making the learning process engaging and practical. With 552 pages, this edition is designed to reinforce fundamental mathematical ideas while providing a solid foundation for further exploration into more advanced topics in statistics.