Key Features of the Fourth Edition * Chapter 4, Probability, is now optional * Ten new smaller data sets, in addition to the hallmark Framingham Heart Study Data * Streamlined! - Organizing Data and Describing Data are now combined into a single chapter * Examples and Exercises include a stronger emphasis on statistical thinking and exploratory data analysis * Additional computer output from Minitab, Data Desk, JMP, SPSS, Resampling Stats, Maple V, and Mathematica