Annenberg Foundation
Annenberg Learner: Interactives: Cast Your Vote!
Upper elementary, middle, and high school students can use this exhibit to get an understanding of how polls and elections are conducted. The discussion includes random samples, margins of error, and other concepts related to statistics.
US Department of Education
National Center for Education Statistics: Nces Classroom
Just what is the NCES Students' Classroom? In addition to many useful features, this site provides math and statistical activities tailored to a middle and elementary school students.