Forensic scientists and archarologists often use equations based on bone size to estimate height. On the first day, the students will learn how to enter data on a graphing calculator and determine a regression line. The femur, or thigh, can also be used. They can measure each other, and also visit another class for more data. Their assignment outside of class is for each student to measure at least six children, ages 2-14 years, and six adults.
All data is entered by the group on a chart and graphed on paper.
After all data is recorded, they are instructed how to enter their data on a graphing calculator, see the scatter plot, and find the equation of the line of regression. The concept of a function becomes very clear. Parabolas and roots of quadratic equations are another concept often appearing to be abstract to students. A second activity using the graphing calculator is introduced after learning the quadratic formula. Various quadratic equations are graphed on the calculator, the number of roots analyzed and the value of the discriminant determined.