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On the back of the worksheet the teacher should copy and paste the three after-activity questions found next to Figure 3 on the website.This is not to be confused with the statistical probability of the change in the population over time as demonstrated with an individual group's data during the M&Ms activity.Note that the average of all of the groups' data more closely resembles the statistical probability of the change over time not the individual group's data.This lesson is designed to help students understand the concepts of radioactive dating to help determine the approximate age of fossils and rocks.After this lesson students will have an understanding of how materials undergo radioactive decay and that the rate of decay allows scientists to predict the approximate age of the specimen.

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Assessment: Have students explain in their own words the concept of half-life in radioactive decay, demonstrate how the rate of radioactive decay and the buildup of the resulting decay product are used in radiometric dating of rocks, and compare and contrast individual statistical data results to the class average of various statistical data results to determine reliability and predictability of the two groups.