50
120
100
80
60
40
20
0
80
70
60
50
40
30
20
10
0
S
4 .99343
R-Sq
73.9%
R-Sq(adj)
7 3.5%
Cr(N)
Cr
Regression
95% CI
95% PI
Fitted Line Plot
Cr = 5.506 + 0.5430 Cr(N)
120
100
80
60
40
20
0
70
60
50
40
30
20
10
0
-10
S
7 .13836
R-Sq
46.7%
R-Sq(adj)
4 5.7%
Ni
Cr
Regression
95% CI
95% PI
Fitted Line Plot
Cr = 5.842 + 0.2818 Ni
4
3
2
1
0
70
60
50
40
30
20
10
0
-10
-20
S
7 .67062
R-Sq
38.5%
R-Sq(adj)
3 7.4%
Co
Cr
Regression
95% CI
95% PI
Fitted Line Plot
Cr = 1.337 + 7.038 Co
16
14
12
10
8
6
4
2
0
70
60
50
40
30
20
10
0
-10
-20
S
8 .02836
R-Sq
32.6%
R-Sq(adj)
3 1.4%
Pb
Cr
Regression
95% CI
95% PI
Fitted Line Plot
Cr = 4.694 + 1.977 Pb
(a)
(b)
(c)
(d)
Fig. 2.7 Linear regression
graphs. (a) Cr vs. Cr(N),
(b) Cr vs. Ni, (c) Cr vs.
Co, (d) Cr vs. Pb
S. Allajbeu et al.