NAME _____________________________________________________ CLASS __________ DATE __________
8.1
LINEAR REGRESSIONS
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 touching A EDIT and pressing 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 | + – |
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| touch D REG, double touch 02 Rg_ax+b, and press |
| ENTER | . |
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3. | To overlay the regression line and the scatter diagram for the data, you must | |||||||||||||||||||||||||||||||||
| first set up the scatter diagram by pressing |
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| , touching | ||||||||||||||||||
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| STAT PLOT |
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| A PLOT1, pressing | ENTER |
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| ▼ | ENTER | ▼ |
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| ▼ | 2ndF |
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| , touching G S.D.,and | |||||||||||||||||||||
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| ENTER |
| 2ndF | L2 | ENTER |
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| touching 3 Scattr. |
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4. | Display the scatter diagram for the data by pressing |
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| and setting | |||||||||||||||||||||||||||
| Xmin = 20, Xmax = 45, Xscl = 5, Ymin = 25, Ymax = 40, and Yscl = 5. | Press | ||||||||||||||||||||||||||||||||
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| GRAPH |
| to view the scatter diagram. |
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5. To view the overlay of the regression line and the scatter diagram, press Y=
CL 
VARS , touch H STAT, press ENTER , touch B REGEQN, double touch 1 RegEqn, and press GRAPH .
Blackline Masters/STATISTICS USING THE SHARP | 79 |
Copyright © 1998, Sharp Electronics Corporation. Permission is granted to photocopy for educational use only.
