Students LOVE this activity! They get to eat or "elim&minate" m&m's while gathering data. In this activity, they should know how to make a scatter plot on a graphing calculator, how to "fit" linear and exponential equations, and how to use the correlation coefficient to determine which equation is the better fit. Encourage students to READ the directions! I have use this activity for many, many years on a Texas Instruments graphing calculator.