Which of the following is the most appropriate for measuring the strength and direction of association between two interval/ratio variables?

ASpearman's rho

BPearson's r ✓ Correct

CPhi

DEta

Correct answer: (B) Pearson's r

Explanation

Pearson's r is the most appropriate measure here.

It measures both the strength and the direction of a linear association.

It is built for interval or ratio level variables.

Its value ranges from -1 to +1, the sign giving direction.

This matches two interval/ratio variables exactly.

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