An understanding of data analysis is essential to the mathematics education of informed citizens. This book illustrates the general notion of statistics as a process while prompting discussions of increasingly complex mathematical issues. It extends and deepens students' knowledge of data analysis, introduces the comparison of data sets with equal and unequal numbers of elements, and presents the analysis of data involving two variables. Using technology with the book's activities can assist students in becoming proficient at "interrogating" data. The supplemental CD-ROM features interactive electronic activities, master copies of activity pages for students, and additional readings for teachers.