Using Blackline Master 9.2
To find the best-fitting quadratic curve (y= ax2+ bx + c) for the data, press
STAT , touch D REG, double touch 04 Rg_x2, and press ENTER . The following
values for the regression will appear:
To view the overlay of the regression curve and the scatter diagram, press Y=
CL VARS , touch H STAT, press ENTER , touch B REGEQN, double touch
1 RegEqn, and press GRAPH . The following overlay will be displayed:
Notice, the r2value for the quadratic regression model is about .9337, whereas
the r2value for the exponential regression model was .9786. The exponential
regression model (with the r2value closer to 1) is considered the better-fitting
model. The exponential regression model even fits better than the linear model
with an r2value of .8553. The students should continue this analysis with the
remaining regression models.

Other Regressions and Model of “Best Fit”/STATISTICS USING THE SHARP EL-9600 47

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