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250
200
150
8
7
6
5
4
3
2
weight
time
S = 1.10466 RSq = 61.5 % RSq(adj) = 58.0 %
time = 13.0028  0.0444460 weight
Time to Chug vs. Weigjht of Person
ACTIVITY 2
 Solutions
Relationship Between Chug Time
and Weight of a Person
From Utts and Heckard. For a statistics class project at a large
northeastern university, students examined the relationship between x = body weight (in pounds)
and y = time to chug a 12 ounce beverage (in seconds). We’ll leave it to you to imagine the
beverage. The student collected data from 13 individuals, and those data are displayed below.
Student
Weight
Time
1
153
5.6
2
169
6.1
3
178
3.3
4
198
3.4
5
128
8.2
6
183
3.5
7
177
6.1
8
210
3.1
9
243*
4.0
10
208
3.2
11
157
6.3
12
163
6.9
13
158
6.7
2.1
Use Minitab on the dataset
Chugging
found in the Datasets folder in ANGEL.
Do
Stat>Regression>Fitted Line Plot.
Click ‘Storage’ and then ‘Residuals’ and ‘Fits’.
These will be stored in columns C4 and C5 and named as RESI1 and FITS1.
Your output
should look as follows:
Regression Analysis: time versus weight
The regression equation is
Note: Explain this equation. Discuss
slope
time = 13.0028  0.0444460 weight
as change in y per unit change in x
in the context of this problem
.
S = 1.10466
RSq = 61.5 %
RSq(adj) = 58.0 %
Analysis of Variance
Source
DF
SS
MS
F
P
Regression
1
21.4093
21.4093
17.5447
0.002
Error
11
13.4230
1.2203
Total
12
34.8323
Delete the big Guy!
1
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View Full Document Regression Analysis: time versus weight
The regression equation is
time = 16.2509  0.0640304 weight
S = 0.864635
RSq = 77.8 %
RSq(adj) = 75.5 %
Analysis of Variance
Source
DF
SS
MS
F
P
Regression
1
26.1532
26.1532
34.9832
0.000
Error
10
7.4759
0.7476
Total
11
33.6292
The NOTE from above: The slope indicates “for a unit change in X, Y will change by the amount
and direction of the slope”.
So here, for a 1 pound increase in Weight the predicted time will
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This note was uploaded on 12/06/2009 for the course STAT 200 at Pennsylvania State University, University Park.
 '08
 BARROSO,JOAOR
 Statistics

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