Years of Experience Salesperson Annual Sales ($1,000s) 80 2. 97 102 4 107 6. 103 101 10 119 10 128 9. 11 127 10 13 136

MATLAB: An Introduction with Applications
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Author:Amos Gilat
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Chapter1: Starting With Matlab
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A sales manager collected the following data on x = years of experience and y = annual sales ($1,000s). The estimated regression equation for these data is ý = 82 + 4x.
Years of
Experience
Annual Sales
Salesperson
($1,000s)
80
2
3.
97
102
4
4
107
103
101
10
119
8.
10
128
6.
11
127
10
13
136
(a) Compute the residuals
Years of
Annual Sales
Residuais
Experience
(S1,000s)
97
4.
102
107
103
101
10
119
10
126
11
127
13
136
Construct a residual plot.
Transcribed Image Text:A sales manager collected the following data on x = years of experience and y = annual sales ($1,000s). The estimated regression equation for these data is ý = 82 + 4x. Years of Experience Annual Sales Salesperson ($1,000s) 80 2 3. 97 102 4 4 107 103 101 10 119 8. 10 128 6. 11 127 10 13 136 (a) Compute the residuals Years of Annual Sales Residuais Experience (S1,000s) 97 4. 102 107 103 101 10 119 10 126 11 127 13 136 Construct a residual plot.
16
16
16
12
12
12
8-
-4'
-4
-4
-8
-12
-12
-16
-16
10
12
14
10 12
Years of Experience
14
10
12
14
Years of Experience
Years of Experience
16
12
4.
-4
-84
-12
-16
6 8 10 12 14
Years of Experience
(b) Do the assumptions about the errer terms seem reasonable in light of the residual plot?
The plat suggests a generally horzontal band of residual points indicating that the error term assumptions apear reasonable
The plot suggests curvature in the residuals indicating that the errer tem asumptions appear reasonatle
The plot seggests a funnel patterm in the residuals indicating that the error term assumptions appeer reasonable
The plot suggests a generaly horizontal bend of residual points indicating that the error term assumptions do not appear reasonable
The plot suggests a funnel pattern in the residuals indicating that the enror term assumgtions do not agpear reasonabie.
spenppag
Senpsay
Transcribed Image Text:16 16 16 12 12 12 8- -4' -4 -4 -8 -12 -12 -16 -16 10 12 14 10 12 Years of Experience 14 10 12 14 Years of Experience Years of Experience 16 12 4. -4 -84 -12 -16 6 8 10 12 14 Years of Experience (b) Do the assumptions about the errer terms seem reasonable in light of the residual plot? The plat suggests a generally horzontal band of residual points indicating that the error term assumptions apear reasonable The plot suggests curvature in the residuals indicating that the errer tem asumptions appear reasonatle The plot seggests a funnel patterm in the residuals indicating that the error term assumptions appeer reasonable The plot suggests a generaly horizontal bend of residual points indicating that the error term assumptions do not appear reasonable The plot suggests a funnel pattern in the residuals indicating that the enror term assumgtions do not agpear reasonabie. spenppag Senpsay
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