1. Scatter Plots on the TI-73 This Power Point is to help guide someone through the following: 1.Create a scatter plot using lists 2.Find the equation for the line of best fit 3.Predict using the equation for the line of best fit

2. Putting Data in Lists 1.Hit the LIST button 2.Enter data under L1 Type: 1, 2, 3, 4, 5, 6 3.Hit ENTER after entering the 6 4. Hit the right arrow Scatter Plots on the TI-73

3. 5.Now enter data under L2 Type: 15, 20, 28, 32, 35, 40 6.Hit ENTER after entering the 40 7.Now we are ready to display our scatter plot! Scatter Plots on the TI-73

4. 8.Hit 2 ND and Y= 9.Hit ENTER on the 1: 10.There is a cursor blinking on the On 11.Hit ENTER on the ON – this turns on Plot1 12.Make sure that Xlist: has L1 and Ylist: has L2 Scatter Plots on the TI-73

5. 13.Hit ENTER on the first option after Type: 14.Hit the WINDOW button 15.Set a range for x and y that fits your data Scatter Plots on the TI-73

6. 16.Use the following for the example data: Xmin= 0 Xmax= 10 Xscl= 1 Ymin= 0 Ymax= 50 Yscl= 5 Scatter Plots on the TI-73

7. 17.Now hit GRAPH – a scatter plot should appear 18.Now we can find the line of best fit for the scatter plot 19.Hit 2 ND and LIST 20. Arrow over to CALC Scatter Plots on the TI-73

8. 21.Arrow down to 5: LinReg(ax+b) 22.Hit ENTER and you should see LinReg(ax+b) 23.Hit ENTER again and you should see the information that gives you the equation for the line of best fit Scatter Plots on the TI-73

9. 24.You should see y=ax+b a=4.971428571 b=10.93333333 Now we need to get the equation into Y= so that it will be graphed Scatter Plots on the TI-73

10. 25.Hit 2 ND Y= You should now see a Cursor blinking beside Y1= 26.Hit 2 ND APPS 27.Arrow DOWN and hit ENTER on 3:Statistics... Scatter Plots on the TI-73

11. 28.Now Arrow RIGHT to EQ and hit ENTER on 1:RegEQ 29.The equation for the line of best fit should be in the Y1 Y1=4.9714285714287X +10.933333333333 Scatter Plots on the TI-73

12. 30. Now hit GRAPH and the graph of the regression line should appear! Scatter Plots on the TI-73

13. Using the Line of Best Fit to Predict 1.Hit 2 ND WINDOW and you now have options for your TABLE SETUP 2.Hit ENTER on Ask over from Indpnt: 3.Hit ENTER on Auto over from Depend:

14. 4.Hit 2 ND GRAPH 5.Now type in a value for X under the X column For example: Type in 20 and you should get 110.36 Using the Line of Best Fit to Predict