A strong correlation exists between stressful life events and the onset of depression, but it is difficult to interpret this relationship because
a. there haven't been enough studies.
b. stress can cause depression, but depression can cause stress.
c. depression is a very subjective state and thus very difficult to measure.
d. people are usually aware of any connection between their depression and stress in their lives.
Question 2
A researcher investigating the link between stressful life events and depression has decided to use a prospective research design. This means that the researcher will have to
a. select subjects with the prospect of becoming depressed.
b. select subjects with the prospect of experiencing stress.
c. follow subjects over time to see if stress predicts the onset of depression.
d. question subjects carefully to see if their depression has always followed some identifiable stress.
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