Which of these would provide the STRONGEST evidence that age-related health problems produce depression?
A) a study showing that depressive symptoms increase after age-related health problems occur
B) a study showing that depressive symptoms increase as one gets older
C) a study showing that older people with depressive symptoms subsequently develop health problems
D) a study showing a positive correlation between depressive symptoms and health problems for older people

Question

Quizplus · Accepted Answer

A study showing that depressive symptoms increase after age-related health problems occur would provide the strongest evidence of a causal relationship, suggesting that the health problems lead to depression.

Which of These Would Provide the STRONGEST Evidence That Age-Related