Weiss offers a comprehensive, traditional approach to introductory statistics, with a heavy emphasis on mathematical reasoning and critical thinking. Weiss's meticulous style offers careful, detailed explanations to ease the learning process. More than 2,600 exercises involve real data from contemporary sources, which promotes active learning and develops readers' ability to think critically with statistics.Introductory Statistics, Ninth Edition, contains parallel presentation of critical-value and p-value approaches to hypothesis testing. This unique design allows both the flexibility to concentrate on one approach or the opportunity for greater depth in comparing the two. The text is suitable for a one- or two-semester course.