Ages Activity for Absolute value and Best fit line.

Objectives:  Students will guess the age of various famous people.
Students will find the absolute value of the difference between their guess and the actual age.
Students will enter the information in to the lists menu of the graphing calculator and graph results.

Materials:  Ages Activity worksheet
Graphing calculator

Procedure:

1.Students are given the Ages Activity worksheet and they are to guess the ages of various famous people.

2.  Students are given the actual age of these people and then they find the absolute value of the difference between their guess and the actual age.

3. Students enter their guesses in L1 and the actual ages in L2. They  graph these lists using the Stat Plot.

4.  Students find the best-fit line and discuss what this line tells them.

5.  Students enter their guess-actual age in L3, the absolute value of this difference in L4, and the square of the result of L3 in L5.

6.  Students find the sum of L4 and L5 and discuss what this tells them about how good their guesses were.

Mary Beth Weier