This lab can be completed with bags of candy, such as Skittles or M&M's. I picked up favor tins from the local craft store and used craft beads (to avoid food allergies). Each tin contains 25 beads of varying colors.
Each student gets a tin and makes a prediction about what color they believe will be most dominant. They then open the tin and sort out the beads. They graph their data and we compile a class data sheet on the board. Students then graph the class data.
This lab not only addresses data, it reviews the steps of the scientific method.