Which one of the following methods serve to measure correlation between two variables? (A) Scatter Diagram (B) Frequency Distribution (C) Two-way table (D) Coefficient of Rank

Which one of the following methods serve to measure correlation between two variables? (A) Scatter Diagram (B) Frequency Distribution (C) Two-way table (D) Coefficient of Rank Correlation
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Answer :

(D) Coefficient of Rank Correlation 
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