Casio fx-CG10 Advanced Operation Manual page 40

Sample Solution—Douglas Fir Trees (continued)
To perform a power regression:
From the scatterplot, press
(Power).
Press
the scatterplot.
d. Which is the best fit—a linear, quadratic, or power function? Explain your
reasoning.
The linear, quadratic, and power regression all provide an r
compare those values. The r
for the linear, quadratic, and power regressions, respectively. All of these r
values indicate a good model, but, a comparison of these values suggests the
quadratic equation is the best model for the data.
Fostering Advanced Algebraic Thinking with Casio Technology
(DRAW) to draw the regression equation on the same axes as
2
values are approximately 0.90, 0.97, and 0.94
(CALC), for more options, then
2
value, so we can
2