Assignment:
Dummy Variable Refer to Data Set in Appendix and use the sex, age, and weight of the bears. For sex, let 0 represent female and let 1 represent male. (In Data Set, males are already represented by 1, but for females change the sex values from 2 to 0.) Letting the response ( y ) variable represent weight, use the variable of age and the dummy variable of sex to find the multiple regression equation. Use the equation to find the predicted weight of a bear with the characteristics given below. Does sex appear to have much of an effect on the weight of a bear?
a. Female bear that is 20 years of age
b. Male bear that is 20 years of age
Data Set: Bears (wild bears anesthetized)
Age is in months, Month is the month of measurement (1= January), Sex is coded with 1= male and 2 = female, Headlen is head length (inches), Headwth is width of head (inches), Neck is distance around neck (in inches), Length is length of body (inches), Chest is distance around chest (inches), and Weight is measured in pounds. Data are from Gary Alt and Minitab, Inc.
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STATDISK:
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Data set name is Bears.
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Minitab:
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Worksheet name is BEARS.MTW.
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Excel:
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Workbook name is BEARS.XLS.
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TI-83/84 Plus:
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App name is BEARS and the file names are the same as for text files.
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Text file names:
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BAGE, BMNTH, BSEX, BHDLN, BHDWD, BNECK, BLEN, BCHST, BWGHT.
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Data Set: Bears (wild bears anesthetized)
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Age
|
Month
|
Sex
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Headlen
|
Headwth
|
Neck
|
Length
|
Chest
|
Weight
|
|
19
|
7
|
1
|
11.0
|
5.5
|
16.0
|
53.0
|
26.0
|
80
|
|
55
|
7
|
1
|
16.5
|
9.0
|
28.0
|
67.5
|
45.0
|
344
|
|
81
|
9
|
1
|
15.5
|
8.0
|
31.0
|
72.0
|
54.0
|
416
|
|
115
|
7
|
1
|
17.0
|
10.0
|
31.5
|
72.0
|
49.0
|
348
|
|
104
|
8
|
2
|
15.5
|
6.5
|
22.0
|
62.0
|
35.0
|
166
|
|
100
|
4
|
2
|
13.0
|
7.0
|
21.0
|
70.0
|
41.0
|
220
|
|
56
|
7
|
1
|
15.0
|
7.5
|
26.5
|
73.5
|
41.0
|
262
|
|
51
|
4
|
1
|
13.5
|
8.0
|
27.0
|
68.5
|
49.0
|
360
|
|
57
|
9
|
2
|
13.5
|
7.0
|
20.0
|
64.0
|
38.0
|
204
|
|
53
|
5
|
2
|
12.5
|
6.0
|
18.0
|
58.0
|
31.0
|
144
|
|
68
|
8
|
1
|
16.0
|
9.0
|
29.0
|
73.0
|
44.0
|
332
|
|
8
|
8
|
1
|
9.0
|
4.5
|
13.0
|
37.0
|
19.0
|
34
|
|
44
|
8
|
2
|
12.5
|
4.5
|
10.5
|
63.0
|
32.0
|
140
|
|
32
|
8
|
1
|
14.0
|
5.0
|
21.5
|
67.0
|
37.0
|
180
|
|
20
|
8
|
2
|
11.5
|
5.0
|
17.5
|
52.0
|
29.0
|
105
|
|
32
|
8
|
1
|
13.0
|
8.0
|
21.5
|
59.0
|
33.0
|
166
|
|
45
|
9
|
1
|
13.5
|
7.0
|
24.0
|
64.0
|
39.0
|
204
|
|
9
|
9
|
2
|
9.0
|
4.5
|
12.0
|
36.0
|
19.0
|
26
|
|
21
|
9
|
1
|
13.0
|
6.0
|
19.0
|
59.0
|
30.0
|
120
|
|
177
|
9
|
1
|
16.0
|
9.5
|
30.0
|
72.0
|
48.0
|
436
|
|
57
|
9
|
2
|
12.5
|
5.0
|
19.0
|
57.5
|
32.0
|
125
|
|
81
|
9
|
2
|
13.0
|
5.0
|
20.0
|
61.0
|
33.0
|
132
|
|
21
|
9
|
1
|
13.0
|
5.0
|
17.0
|
54.0
|
28.0
|
90
|
|
9
|
9
|
1
|
10.0
|
4.0
|
13.0
|
40.0
|
23.0
|
40
|
|
45
|
9
|
1
|
16.0
|
6.0
|
24.0
|
63.0
|
42.0
|
220
|
|
9
|
9
|
1
|
10.0
|
4.0
|
13.5
|
43.0
|
23.0
|
46
|
|
33
|
9
|
1
|
13.5
|
6.0
|
22.0
|
66.5
|
34.0
|
154
|
|
57
|
9
|
2
|
13.0
|
5.5
|
17.5
|
60.5
|
31.0
|
116
|
|
45
|
9
|
2
|
13.0
|
6.5
|
21.0
|
60.0
|
34.5
|
182
|
|
21
|
9
|
1
|
14.5
|
5.5
|
20.0
|
61.0
|
34.0
|
150
|
|
10
|
10
|
1
|
9.5
|
4.5
|
16.0
|
40.0
|
26.0
|
65
|
|
82
|
10
|
2
|
13.5
|
6.5
|
28.0
|
64.0
|
48.0
|
356
|
|
70
|
10
|
2
|
14.5
|
6.5
|
26.0
|
65.0
|
48.0
|
316
|
|
10
|
10
|
1
|
11.0
|
5.0
|
17.0
|
49.0
|
29.0
|
94
|
|
10
|
10
|
1
|
11.5
|
5.0
|
17.0
|
47.0
|
29.5
|
86
|
|
34
|
10
|
1
|
13.0
|
7.0
|
21.0
|
59.0
|
35.0
|
150
|
|
34
|
10
|
1
|
16.5
|
6.5
|
27.0
|
72.0
|
44.5
|
270
|
|
34
|
10
|
1
|
14.0
|
5.5
|
24.0
|
65.0
|
39.0
|
202
|
|
58
|
10
|
2
|
13.5
|
6.5
|
21.5
|
63.0
|
40.0
|
202
|
|
58
|
10
|
1
|
15.5
|
7.0
|
28.0
|
70.5
|
50.0
|
365
|
|
11
|
11
|
1
|
11.5
|
6.0
|
16.5
|
48.0
|
31.0
|
79
|
|
23
|
11
|
1
|
12.0
|
6.5
|
19.0
|
50.0
|
38.0
|
148
|
|
70
|
10
|
1
|
15.5
|
7.0
|
28.0
|
76.5
|
55.0
|
446
|
|
11
|
11
|
2
|
9.0
|
5.0
|
15.0
|
46.0
|
27.0
|
62
|
|
83
|
11
|
2
|
14.5
|
7.0
|
23.0
|
61.5
|
44.0
|
236
|
|
35
|
11
|
1
|
13.5
|
8.5
|
23.0
|
63.5
|
44.0
|
212
|
|
16
|
4
|
1
|
10.0
|
4.0
|
15.5
|
48.0
|
26.0
|
60
|
|
16
|
4
|
1
|
10.0
|
5.0
|
15.0
|
41.0
|
26.0
|
64
|
|
17
|
5
|
1
|
11.5
|
5.0
|
17.0
|
53.0
|
30.5
|
114
|
|
17
|
5
|
2
|
11.5
|
5.0
|
15.0
|
52.5
|
28.0
|
76
|
|
17
|
5
|
2
|
11.0
|
4.5
|
13.0
|
46.0
|
23.0
|
48
|
|
8
|
8
|
2
|
10.0
|
4.5
|
10.0
|
43.5
|
24.0
|
29
|
|
83
|
11
|
1
|
15.5
|
8.0
|
30.5
|
75.0
|
54.0
|
514
|
|
18
|
6
|
1
|
12.5
|
8.5
|
18.0
|
57.3
|
32.8
|
140
|