1. Line of Best Fit In a Scatter plot there is usually no single line that passes through all of the data points, so we must try to find the line that best fits the data. Example:

2. To Approximate a Line of Best Fit: 1.) Plot the points 2.) Try to find a line that approximates the data 3.) Locate two points on your line (These do not have to be original points) 4.) Find the equation of the line 1.) Graph the following points on graph paper and write the equation of your line of best fit. x012345y133446x012345y133446

3. 2.) Graph the following points and find the equation of your line of best fit. diameter (d) 41040352535 20 Age (y) 1 5 20 15 10 15 20 Age of Trees and Diameter of Trunk

4. Selecting the Line of Best Fit 1.)

5. 2.)

6. Finding the equation of a line of best fit 1.) D.

7. 2.) D. y = -5x +55

8. Demonstrate Understanding: 1.) D.

9. 2.) D. the entrance fee to the carnival

10. 3.)

11. Graph using the graphing calculator