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An examination of 11 applicants for an accountant post was taken by a finance company. The marks obtained by the applicants in the reasoning and aptitude tests are given below.

Applicant A B C D E F
Reasoning test 20 50 28 25 70 90
Aptitude test 30 60 50 40 85 90
Applicant G H I J K
Reasoning test 76 45 30 19 26
Aptitude test 56 82 42 31 49

Calculate Spearman’s rank correlation coefficient from the data given above.

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N = 11, Σd2 = 22 

Rank correlation

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