If the correlation coefficient between variables X and Y is.90, this means that the proportion of common variance shared by the two variables is ninety percent.

Name: If the correlation coefficient between variables X and Y is.90, this means that the proportion of common variance shared by the two variables is ninety percent.
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Quizplus · Accepted Answer

The proportion of common variance shared by the two variables is determined by squaring the correlation coefficient, so in this case, it would be $0.90^2 = 0.81$ or 81%, not 90%.

If the Correlation Coefficient Between Variables X and Y Is