Regression on the TI-83 

HOW TO ENTER DATA:
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First delete old data -
Press [2nd]-[MEM].
Choose "ClrAllLists".
Press [ENTER] two times so that you see the calculator display "Done".

Now enter new data -
Press [STAT].
Choose "Edit".  
Enter your 'x' values in column L1, and your 'y' values in column L2.

HOW TO CALCULATE THE REGRESSION CURVE:
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Press [STAT].
Choose "CALC" using the arrow keys.
Choose which regression you want - 
   "LinReg(ax+b)" gives the best fitting line to your data,
   "ExpReg" gives the best fitting exponential function to your data, etc.
Press [ENTER] two times so that the calculator displays the formula 
for that best fitting regression curve.  Write down the formula on paper.


HOW TO SET UP YOUR DATA TO BE PLOTTED:
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Press [2nd]-[STAT PLOT].
Press [ENTER] to use "Plot1". 
Choose On
       Type: the first of those 6 plot types (i.e., the dots)
       Xlist: L1
       Ylist: L2
       Mark:  the box or plus sign work best (the dot is too small).

HOW TO PLOT YOUR DATA AND THE REGRESSION CURVE:
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Press [Y=].
Make sure that only "Plot1" at top of the screen is highlighted.
To enter the formula for your regression curve at Y1=, you can either
type it by hand or get it from the calculator directly by doing the following:
  Press [VARS].
  Choose "Statistics".
  Choose "EQ" using the arrow keys.
  Choose "RegEQ".

Now to get your graph,
Press [ZOOM].
Choose "ZoomStat".