Mathematics · Statistics

If the coefficient of determination (r2) between two variables is 0.81, what is the possible value of the correlation coefficient (r)?

Verified Solution4 OptionsUpdated: October 2026👁️1 View

1Must be +0.9 only
20.656
3Either +0.9 or -0.9✓
4Must be -0.9 only

Correct answer

Either +0.9 or -0.9

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