Two ladies were asked to rank ten different types of cell phones. The ranks given by them are given below:
Cell PhoneABCDEFGHIJTina16395271084Rita68372159410
Calculate Spearman's rank correlation coefficient.
RankRankD=R1−R2D2R1R216−52568−24330097245239211175241091184416410−636N=10∑D=0∑D2=100
Spearman's rank coefficient = rk=1−6∑D2N3−N
rk=1−6×100103−10 =1−600990⇒1−0.606=0.394