The personnel department of a certain industrial firm used 12 subjects in a study to determine the relationship between job performance rating (y) and scores on four tests. The data are as follows:
y
x1
x2
x3
x4
11.2
56.5
71.0
38.5
43.0
14.5
59.5
72.5
38.2
44.8
17.2
69.2
76.0
42.5
49.0
17.8
74.5
79.5
43.4
56.3
19.3
81.2
84.0
47.5
60.2
24.5
88.0
86.2
47.4
62.0
21.2
78.2
80.5
44.5
58.1
16.9
69.0
72.0
41.8
48.1
14.8
68.0
42.1
46.0
20.0
85.0
60.3
13.2
58.3
37.5
47.1
22.5
87.2
51.0
65.2
Estimate the regression coefficients in the model
=b0 +b1x1 +b2x2 +b3x3 +b4x4.
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