A researcher finds a correlation of +.90 between two variables.Assuming the correlation coefficient was calculated correctly,which of the following is definitely not true?
A) Ability to make predictions for these variables is good.
B) As values on one measure increase, values on the other measure decrease.
C) A third variable may be present that explains the correlation.
D) The variables may be causally related.

Question

Quizplus · Accepted Answer

A correlation coefficient of +.90 indicates a very strong positive relationship between the two variables, but it does not necessarily mean that as one variable increases, the other must decrease. It is possible for both variables to increase together or for neither to change in a perfectly correlated relationship. Therefore, choice B is definitely not true. All other options may be possible with a correlation coefficient of +.90.

A Researcher Finds a Correlation of