GRAPHING AND LINEAR REGRESSIONS



GRAPHING AND LINEAR REGRESSIONS

TI-82 and TI-83

1. Press “Y= CLEAR” to clear all functions.

2. Press “STAT 4 2nd 1 , 2nd 2 ENTER” to clear the lists in the statistics menus.

3. Press STAT 1 to enter the data entry screen. All lists should be empty – if they are not, redo #2.

4. First enter the x-axis values in L1 by typing each measurement and pressing the ENTER key between each value.

5. After you have finished, you need to enter the y-axis values in L2. After entering your last x-value, press ( to move to L2, go back up to the top, and enter the data like you did in step 4.

6. Press “2nd Y= 4 ENTER” to turn off all stats plots.

7. Press “2nd Y=” again and this time choose “1” from the menu to view the first plot set-up screen. Similar to setting the MODE of the calculator, you want to choose the options that apply to your graph. Choose each option and then press “ENTER”.This usually includes: “ON SCATTERPLOT (graph with no line) Xlist: L1 Ylist: L2 Mark (your choice)”

8. Now Press “WINDOW” and enter the values needed to set the axes of your graph. You will enter minimum and maximum values for the X- and Y-axis as well as set the scale. See example to the left.

Your X min is usually zero as well as your Y min. The X max should be slightly above your highest X-value and the same goes for Y. Choose “1” for the scale. This changes with every graph. Don’t change XRES.

9. Press “GRAPH” to see your scatterplot graph. All data points should appear on the graph. If they do not, go back to “WINDOW” and fix XMAX and YMAX.

10. To get the slope of the line and view the linear regression line, press “STAT ( 5 ENTER” if you are using the TI-82 and “STAT ( 4 ENTER” if you are using the TI-83. If your get an error, press “ENTER” and clear the screen. Then try step 10 again.

11. If you need to view the line on top of the scatterplot graph, press “Y= VARS 5 ( ( 7 GRAPH”

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