Exponential Regression
The exponential regression option finds the equation of an exponential equation of
the form y = abx that best fits a set of data.
First, press 
to
enter the data .
Press 
to view the statistics calculation options.
The values of y must be greater than zero. (This is because the method for determining
the values of a and b in the regression equation is a least-squares fit on the
values for x and ln y.)
Press 
.
Enter the columns to be used for the x and y entries, c1 and c2 in this case.
The regression equation can be automatically stored in the equation editor by selecting
the Stor RegEQ.
Therefore, the best-fit exponential equation for this data is approximately y = 2.80(0.84)x.
Note: The TI-92 calculates the correlation coefficient, r and the correlation of determination,
R2.