In a Correlational Study of Level of Education and Level

In a correlational study of level of education and level of depression, the investigators are trying to observe the relationship between these two variables. This type of study would differ from experimental studies in several important respects. For instance, __________.

A) in correlational studies, it is difficult to determine what is causing what
B) correlational studies can suffer from what is called the third-variable problem
C) random assignment is not an option in correlational studies
D) all of the above are correct

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