Which of the following statements is TRUE concerning a correlation coefficient?
A) A restricted range in either correlated variable makes the correlation lower.
B) A correlation coefficient provides information regarding causation.
C) No meaning is attached to the sign of a correlation coefficient, since the coefficient is ultimately squared.
D) Restriction of range is now illegal in the 48 contiguous states.

Question

Quizplus · Accepted Answer

A restricted range in either variable can lead to an underestimation or overestimation of the true correlation, making it lower. For example, if only high achieving students were selected in a study, the correlation between attendance and grades may be artificially inflated.

Which of the Following Statements Is TRUE Concerning a Correlation