Which of the following statements about the correlation coefficient is true?
(A)The correlation coefficient and the slope of the regression line may have opposite signs. (B)A correlation of 1 indicates a perfect cause-and-effect relationship between the variables. (C)Correlations of +0.87 and -0.87 indicate the same degree of clustering around the regression line. (D)Correlation applies equally well to quantitative and categorical data.
C