The scores obtained by students of Environmental Engineering have been recorded in two courses semester, "Hidrologia"and "ecologia". The data appear in the following table. The Spearman's rank correlation coefficient is equal to: Hidrología Ecología 90 80 94 95 89 96 75 92 85 89 86 84 91 90 Alternatives .0.2429 0.1429 b) 0.1539 c) d) 0.1549

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