Spearman method of correlation was propounded in: / स्पियरमैन सहसम्बन्ध रीती का प्रतिपादन हुआ था:
(a) 1920
(b) 1980
(c) 1904
(d) None of these / इनमे से कोई नहीं
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D none of these . Hopes it helps
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