26 Calculator Steps for Regression Problems (TI83/84) 1. Getting Started: Clear any equations in Y1, Y2etc. Be sure PLOT1 is shaded (on). (If it is not, arrow up to it and hit enter to turn it on.) Be sure the Diagnostics are ON. (Under Catalog, go down to Diagnostics On and hit Enter twice.) 2. To enter the data: Hit STAT Enter. Clear any old data (arrow up to L1, hit CLEAR and ENTER and do the same with L2). Enter the new data. 3. To get the scatterplot: Hit ZOOM 9. 4. To get the regression equation: Hit STAT, arrow over to CALC and then select the kind of regression line you want (linear, quadratic, etc), entering the corresponding number and then hit ENTER. (Steps 5 & 6 allow you to see the graph of the line along with the original points. Very interesting but not necessary for the homework.) 5. To get the equation into Y1: Hit the Y= button. Hit VARS, 5 (statistics), arrow over to EQ and hit ENTER. 6. To graph the line onto the scatterplot: Hit GRAPH. 7. To evaluate the regression equation: Use the equation you selected from the multiple choice answers in the homework and just substitute in the number given. If the equation has not been rounded off from what the graphing calculator gives, you may be able to use the TABLE feature of your calculator to find the answer.