Regression on the TI-85

HOW TO ENTER DATA:
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Press [STAT].
Choose "EDIT".
The screen displays -
 xlist Name=x  (if you prefer, you can name your xlist something other than x)
 ylist Name=y  (if you prefer, you can name your ylist something other than y)
Press [ENTER] twice.  

To clear previous data, choose "CLRxy".  

Now enter your data -
You first enter the x-value for one of your points followed
by the corresponding y-value.  Continue entering each of your
x and y-values in turn.

HOW TO CALCULATE THE REGRESSION CURVE:
======================================
Press [STAT].
Choose "CALC".
The screen displays -
 xlist Name=x  
 ylist Name=y 
Press [ENTER] twice.
Choose which regression you want -
   "LINR" gives the best fitting line to your data,
   "EXPR" gives the best fitting exponential function to your data, etc.
Write down the formula on paper - the linear function is displayed in the
form y=a+bx, while the exponential function is displayed in the
form y=a*b^x.

HOW TO SET UP YOUR DATA TO BE PLOTTED:
=======================================
Press [GRAPH].
Choose "RANGE".
Use your data to decide appropriate values for xMin, xMax, yMin, and yMax.

HOW TO PLOT YOUR DATA AND THE REGRESSION CURVE:
===============================================
Press [STAT].
Choose "DRAW".
Choose "SCAT".
Choose "DRREG".