line of best fit on the graphing calculator

1. DETERMINING A LINE
OF BEST FIT
(USING A GRAPHING CALCULATOR)
Goal: Determine an equation for a line of best fit
using a graphing calculator and define the squared
deviation for the determined equation.

2. WARM UP
There are 3 steps you need to take in order to plot points on a
calculator, what are they? (Feel free to use your graphing
calculator guide)
1. Turn Plot 1 On (2nd – Stat Plot)
2. Enter your data under L1 and L2 (STAT – Edit)
3. Adjust your window
4. Press Graph

3. Enter this data under L1 and L2
Press STAT

4. Enter this data under L1 and L2
Press “Edit”

5. Enter this data under L1 and L2

6. Enter this data under L1 and L2

7. Enter this data under L1 and L2

8. Enter this data under L1 and L2

9. Press “STAT”

10. Press the right arrow to highlight CALC and choose the function
“LinReg”.

11. Press the right arrow to highlight CALC and choose the function
“LinReg”.

12. Press “Enter” to get the equation.

13. Round each number to the nearest thousandth (three decimal
places) & substitute them into the equation “ax+b” to get an
equation for a
line of best fit.

14. y = 0.240x + -400.989
THIS IS YOUR EQUATION FOR THE LINE OF BEST
FIT!!!!!!