Get a Half-life!
High schoolers use m&m candies as their sample set. They begin by counting the total number of candies to determine their sample size. Students put the candies into a cup and shake them gently before pouring them onto a paper plate. Count the m&m's with the "m" showing (high schoolers may eat these). The remaining m&m's are counted, and the process continues until all candies are gone. On a graphing calculator, students explore the data they have collected and choose the best fit for the data.