In this experiment, the students learn about the basics of probability and what happens depending on the sample size. The students predict based on a sample what is in their bag and then find out if the are correct. Then using the actual data the students calculate probabilities based on individual, group and class results. They graph this information as well.
There are questions along with this activity that ask why and get at their thinking. In the end they compare the class results with the actual data for the company. I then save the data each year and compile a running list to show them the more data we have, the closer we get.
It can be modified for younger students by taking out the circle graphs and just having them do the bar graph.