If two measurement variables are both found to be changing over time, what does this mean?
A)It means there is a causal link between the two variables.
B)It means there is a common cause of the changes in both variables (possibly other than time).
C)It means that even though the two variables may be highly correlated, they could be completely unrelated in terms of cause and effect.
D)None of the above.

Question

Quizplus · Accepted Answer

Two variables changing over time may be correlated due to a common trend or external factor, but this does not imply a causal relationship.

If Two Measurement Variables Are Both Found to Be Changing