6.9 Rank Correlation

Competitor	Judge_1	Judge_2	rank_1	rank_2
1	20	15	1	4
2	18	20	3	1
3	16	14	5	5
4	17	13	4	6
5	15	18	6	2
6	12	10	9	8
7	11	17	10	3
8	19	9	2	9
9	14	12	7	7
10	13	8	8	10

Coefficient, \(\rho = 1- \frac{6 \sum d_i^2}{n(n^2-1)}\)