OpenIntro Statistics

David M Diez, Christopher D Barr, Mine Cetinkaya-Rundel

The OpenIntro project was founded in 2009 to improve the quality and availability of education by producing exceptional books and teaching tools that are free to use and easy to modify. Our inaugural effort is OpenIntro Statistics. Probability is optional, inference is key, and we feature real data whenever possible. Files for the entire book are freely available at

OpenIntro has grown through the involvement and enthusiasm of our community. Visit our website, We provide videos, labs for R and SAS, teaching resources like slides, and many other helpful resources.