The linear regression option finds the equation of
the form y = ax + b that best fits a set of data.
First, enter the data.
The data shown here are the points {(2,11.4), (3,17), (5,27.3), (7,36.1),
(11,47.7), (13,49.9)}.
Press 
to view the statistics calculation options.
Press 
for regressions, then
to select linear.
Therefore, the best-fit linear equation for this data is approximately y = 3.53x + 7.42.
The correlation coefficient, r, is about 0.98 and the coefficient of
determination, r2, is about 0.96 indicating a good fit.
Note: The resulting linear equation is an exact fit if two nonvertical data points
are entered. If an error message occurs, make
sure the data was entered correctly or press
to view the setup.
Use 
, 
,
and the menu keys to select List1 for 2Var XList,
List2 for 2Var YList,
and 1 for 2Var Freq.