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The correlation coefficient from the following data N = 25, ΣX = 125, ΣY = 100, ΣX2 = 650, ΣY2 = 436, ΣXY = 520: 

(a) 0.667 

(b) -0.006 

(c) -0.667 

(d) 0.70

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Answer is (a) 0.667

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