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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, and anybody can purchase a paperback copy from for under $10.

The future for OpenIntro depends on the involvement and enthusiasm of our community. Visit our website, We provide free course management tools, including an online question bank, utilities for creating course quizzes, and many other helpful resources.

Click here for details.

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