Divided into 62 short sections, this text allows instructors to assign only those sections needed to meet the goals of the course. Humorous riddles allow students to check their work without providing the answers; if the answer to a riddle makes sense, then students know they have answered all questions in an exercise correctly. All major statistics typically introduced in a first- semester course are covered. New to this edition: This edition contains new material on effect size, which provides technical solutions to issues raised earlier in the book (such as the limitations of inferential statistics).