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Which of the following are true statements about the correlation coefficient r? I. A correlation coefficient...

Which of the following are true statements about the correlation coefficient r? I. A correlation coefficient of .3 means that 30% of the points are highly correlated. II. The square of the correlation measures the proportion of the y-variance that is predictable from a knowledge of x. III. Perfect correlation, that is, when the points lie exactly on a straight line is r = 0.

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The only true statement among the given ones is:

II. The square of the correlation measures the proportion of the y-variance that is predictable from a knowledge of x.

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