Using the table below compute the spearman rank correlation coefficient for the aggressiveness scores. Does this suggest that both twins tend to be similar in degrees of aggressiveness?
|
Twin set
|
1st born aggressiveness scores (rank) x
|
2nd born aggressiveness scores (rank) y
|
Ranked pair (x.y)
|
Term r(x1)r(y1)
|
|
1
|
85(8)
|
88(10)
|
(8,10)
|
80
|
|
2
|
71(3.5)
|
78(7)
|
(3.5,7)
|
24.5
|
|
3
|
79(6.5)
|
75(5.5)
|
(6.5,5.5)
|
35.75
|
|
4
|
69(1)
|
64(2.5)
|
(1,2.5)
|
2.5
|
|
5
|
92(12)
|
96(12)
|
(12,12)
|
144
|
|
6
|
72(5)
|
72(4)
|
(5,4)
|
20
|
|
7
|
79(6.5)
|
64(2.5)
|
(6.5,2.5)
|
16.25
|
|
8
|
91(11)
|
89(11)
|
(11,11)
|
121
|
|
9
|
70(2)
|
62(1)
|
(2,1)
|
2
|
|
10
|
71(3.5)
|
80(9)
|
(3.5,9)
|
31.5
|
|
11
|
89(10)
|
79(8)
|
(10,8)
|
80
|
|
12
|
87(9)
|
75(5.5)
|
(9,5.5)
|
49.5
|