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14
Advanced Keyboard/STATISTICS USING THE SHARP EL-9900
Copyright © 2002, Sharp Electronics Corporation. Permission is granted to photocopy for educational use only.
Steps for calculating the best-fitting line
1. Turn the calculator on and press STAT to enter the statistics menu.
Access the data entry screen by pressing A (EDIT) ENTER .
Delete old data and enter the following data set:
X Y
25 32
28 33
31 27
40 38
29 30
Check the data you have entered and correct any errors you may find.
2. To find the best-fitting line (regression line) for the data, press STAT
D (REG) 0 2 (Rg_ax+b) and press ENTER .
3. To overlay the regression line and the scatter diagram for the data, you must
first set up the scatter diagram by pressing STAT PLOT A (PLOT1)
ENTER ENTER ▼ ENTER ▼ 2ndF L1 ENTER 2ndF L2
ENTER STAT PLOT G (S.D.) and 3 (Scattr ).
4. Display the scatter diagram for the data by pressing WINDOW and setting
Xmin = 20, Xmax = 45, Xscl = 5, Ymin = 25, Ymax = 40, and Yscl = 5. Press
GRAPH to view the scatter diagram.
5. To view the overlay of the regression line and the scatter diagram, press
Y= CL 2ndF VARS H (STAT) ENTER B (REGEQN) 1 (RegEqn)
GRAPH .
LINEAR REGRESSIONS
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