Table 15.1 shows the weights x1 to the nearest pound (lb), the heights x2 to the nearest inch (in), and the ages x3 to the nearest year of 12 boys.
(a) Find the least-squares regression equation of x1 on x2 and x3.
(b) Determine the estimated values of x1 from the given values of x2 and x3.
(c) Estimate the weight of a boy who is 9 years old and 54 in tall.
(d) Find the least-squares regression equation using EXCEL, MINITAB, SPSS and STATISTIX.
Weight (X1)
64
71
53
67
55
58
77
57
56
51
76
68
Height (X2)
59
49
62
50
48
52
42
61
Age (X3)
8
10
6
11
7
9
12
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