Question 1 - Pearson Correlation — properties; Covariance — scale-dependence Practice | Prasnya
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Association Between Two Variables - Association Between Two...
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Question 1
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Suppose X and Y are two numerical variables measured on the same n individuals. Let Cov(X, Y) and r_XY represent the sample covariance and sample correlation coefficient, respectively. Which statement(s) is/are always true?
Multiple correct
Medium Difficulty
15 March 2026
A
If r_XY > 0, then Cov(X, Y) > 0.
B
−2 < r_XY < 2
C
Cov(2X, Y) = Cov(X, Y)
D
Correlation is a unitless measure of association.