а. Following is the scatter diagram and the regression line. 00 200 400 600 800 1000 1200 1400 1600 enroll b. Which point is an outlier? c. Is the outlier influential? Explain. °olo of 006 008 00L 009 009 O0ide

MATLAB: An Introduction with Applications
6th Edition
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Author:Amos Gilat
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Chapter1: Starting With Matlab
Section: Chapter Questions
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a. Following is the scatter diagram and the regression line.
008 o
2 00
Co
8.
o00
o o
200
400
600
800
1000
1200
1400
1600
enroll
b. Which point is an outlier?
c. Is the outlier influential? Explain.
006
08
02
009
009
Ooide
Transcribed Image Text:a. Following is the scatter diagram and the regression line. 008 o 2 00 Co 8. o00 o o 200 400 600 800 1000 1200 1400 1600 enroll b. Which point is an outlier? c. Is the outlier influential? Explain. 006 08 02 009 009 Ooide
4. The following output from R presents the results from computing a linear model.
In our data example we are interested to study the relationship between students' academic performance
api00 with variable enroll which is the number of students in the school.
Call:
Im (formula = api00
enroll, data = d)
Residuals:
мin
10 Median
30
Маx
-285.50 -112.55
-6.70
95.06
389.15
Coefficients:
Estimate Std. Error t value Pr(>|t|)
(Intercept) 744.25141
15.93308
46.711
< 2e-16 ***
enroll
-0.19987
0.02985
-6.695 7.34e-11 ***
---
Signif. codes:
O ' *** ' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1
Residual standard error: 135 on 398 degrees of freedom
Multiple R-squared: 0.1012, Adjusted R-squared:
F-statistic: 44.83 on 1 and 398 DF, p-value: 7.339e-11
0.09898
Transcribed Image Text:4. The following output from R presents the results from computing a linear model. In our data example we are interested to study the relationship between students' academic performance api00 with variable enroll which is the number of students in the school. Call: Im (formula = api00 enroll, data = d) Residuals: мin 10 Median 30 Маx -285.50 -112.55 -6.70 95.06 389.15 Coefficients: Estimate Std. Error t value Pr(>|t|) (Intercept) 744.25141 15.93308 46.711 < 2e-16 *** enroll -0.19987 0.02985 -6.695 7.34e-11 *** --- Signif. codes: O ' *** ' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1 Residual standard error: 135 on 398 degrees of freedom Multiple R-squared: 0.1012, Adjusted R-squared: F-statistic: 44.83 on 1 and 398 DF, p-value: 7.339e-11 0.09898
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