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BLACK AND WHITE PAPERBACK. Full color hardcovers are also available through the hardcover book link. Books are printed on demand, so Amazon can satisfy any order size. 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. We feature real data whenever possible, and files for the entire textbook are freely available at openintro.org. The future for OpenIntro depends on the involvement and enthusiasm of our community. Visit our website, openintro.org. We provide free videos, statistical software labs, lecture slides, course management tools, and many other helpful resources.