HOW TO FIND REGRESSION EQUATIONS WITH TI89 CALCULATOR

Steps	Key Sequence	Screens
1. Input Data into Lists	Press APPS key
	Press 6 (for Data/Matrix Editor)
	Press 3 (for New...)
	Press right arrow key
	Press 3 (for List)
	Press down arrow key to Variable and enter a name
	Press ENTER (for Save)
	Press ENTER (To exit)
NOTE: To enter values, type number, then ENTER. At any time, to move to a different cell, use arrow keys. If the calculator is set to exact, the values will appear as rational numbers.
	Enter values of independent variable into c1
	Enter values of dependent variable into c2
2. Find the Regression Equation	Press F5 key
	Press right arrow key
	Choose appropriate regression
NOTE: In this case I chose ExpReg (i.e., Exponential Regression)
	Press down arrow key once, then type c1 into box for x, then ENTER
NOTE: You may need to press ALPHA key to turn on/off letters.
	Press down arrow key once, then type c2 into box for y, then ENTER
	Press down arrow key once, then right arrow key
	Using arrow keys, select appropriate function, then ENTER
	Press ENTER (to save)
Note the regression values. In this case, the regression equation is y = (0.7978) (0.846468)x.
	Press ENTER (to exit)
3. Graph the Regression Equation with the Data	Press 2nd, then ESC (to quit editor)
	Press DIAMOND key, then F1 (for Y=)
NOTE: Deselect all but the regression equation that you stored above – use up/down arrow keys to select functions, then press F4.
	Use up/down arrow keys to move to Plot1
	Press ENTER
	Press right arrow key
	Press 1 (for Scatter)
	Press down arrow key twice, then type type c1 into box for x, then ENTER
	Press down arrow key, then type type c2 into box for y, then ENTER
	Press ENTER (to save)
	Press F2, then 6 (for ZoomData)
NOTE: Press F3 to trace the function. Use left/right arrow keys to move along the data or function and use up/down arrow keys to move between the function and the data.