posted by John on .
Suppose a study finds that the correlation coefficient relating family income and SAT scores is r = +0.98. Which of the following are proper conclusions?
I. Poverty causes low SAT scores
II. Wealth causes high SAT scores
III. There is a very strong association between family income and SAT scores
I and II only
II and III only
III only. Correlation coefficients do not indicate causality, only a relationship.