Other
An Introduction to 2 Way Tables
Site has an example problem worked through showing how a two-way table is constructed, read, and used. Discussion then continues with a handful of learning exercises for the user to practice.
National Council of Teachers of Mathematics
Nctm: Figure This: Who's on First Today?
Batter up! Who has the higher batting average, Joe McEwing or Mike Lieberthal? Try your computation and averaging skills in this real-world math challenge. Learn how sharpening your averaging skills can be valuable in real life...