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Summary: This book explains what statistics mean and how they are used, rather than how to calculate them. It walks readers through basic concepts as well as some of the most complex statistical models in use. This edition adds coverage of big data to better address its impact on p-values and other key concepts; material on small data to show readers how to handle data with fewer data points than optimal; and other new topics like missing data and effect sizes. The book's two characters, a high school principal and a director of public health, return in the this edition, with their examples expanded and updated with reference to contemporary concerns in the fields of education and health.