Sharp EL-9600 manual Other Regressions Model of Best FIT, Model of best fit

NAME _____________________________________________________ CLASS __________ DATE __________

9.2

OTHER REGRESSIONS

AND MODEL OF “BEST FIT”

Steps for calculating other regression models

1. 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 .

2. 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.

Model of best fit

1.Notice, the r 2 value for the quadratic regression model is about .9337.

2.Whereas ther 2 value for the exponential regression model was .9786.

3.The exponential regression model (with the r 2 value closer to 1) is considered the better-fitting model. The exponential regression model even fits better than the linear model with an r 2 value of .8553.

4.Continue this analysis with other regression models.

Blackline Masters/STATISTICS USING THE SHARP EL-9600 83

Copyright © 1998, Sharp Electronics Corporation. Permission is granted to photocopy for educational use only.