Using the TI 83 to find the Line of Best Fit or Least Square Regression Line
Step 1:
Enter the data into List 1 (L1)
STAT
1
OR
ENTER
To see the graph of the scatterplot
Step 2:
Make sure plot 1 is on , showing a scatterplot, and the correct lists L1, L2.
2nd
y=
If it is go to step 3.
If it is not on do the following (Off and showing a histogram)
ENTER to get into the settings and then arrow to change what you need to change.
Pushing ENTER when the arrow is in the correct position (ON and scatterplot) will turn
the plot on and change the graph to a scatter plot.
Step 3:
ZOOM
9
to see the graph
Step 4:
2nd
Quit
This is not a necessary step, but it will take back to the
main screen
Step 5:
Step 5:
STAT
VARS
arrow to CALC 4 or move down to 4
ENTER
arrow to y-vars
ENTER
ENTER
ENTER
This screen shows the line of best fit, the slope(b),
the y-intercept(a), the coefficient of
determination(r2),and the correlation(r). R2 and r
are used in statistics.