Which statement is TRUE concerning a coefficient of correlation?
A) A correlation coefficient is an index of the causal relationship between two variables.
B) A correlation coefficient may be useful in prediction.
C) It covaries with the standard deviation.
D) It came about as a result of someone asking Francis Galton what his "sign" was.

Question

Quizplus · Accepted Answer

A correlation coefficient is a statistical measure that indicates the extent to which two variables are linearly related. It ranges from -1 to 1, and is useful in predicting the value of one variable based on the value of the other. However, it does not indicate causation, only correlation. The correlation coefficient is not related to the standard deviation, and was not developed by Francis Galton.

Which Statement Is TRUE Concerning a Coefficient of Correlation