Moderate -0.8 This is a straightforward application of Spearman's rank correlation coefficient formula with minimal calculation. The question explicitly tells you that only 2 dancers differ by 1 rank position while 5 are identical, making the computation of Σd² trivial (just 1² + 1² = 2). This requires only formula recall and basic arithmetic, making it easier than average.
Two judges placed 7 dancers in rank order. Both judges placed dancers A and B in the first two places, but in opposite orders. The judges agreed about the ranks for all the other 5 dancers. Calculate the value of Spearman's rank correlation coefficient. [4]
Two judges placed 7 dancers in rank order. Both judges placed dancers A and B in the first two places, but in opposite orders. The judges agreed about the ranks for all the other 5 dancers. Calculate the value of Spearman's rank correlation coefficient. [4]
\hfill \mbox{\textit{OCR S1 2009 Q2 [4]}}