In order for epidemiologists to infer that Behavior A causes Disease B, they must observe
A) that Behavior A has taken place before Disease B takes place.
B) a dose-response relationship between Behavior A and Disease B.
C) a decline in Disease B when Behavior A is eliminated.
D) all of these relationships between variables exist.
Question 2
A direct, consistent relationship between the independent variable and the dependent variable
A) is an example of the placebo effect.
B) is an example of the nocebo effect.
C) defines dose-response relationship.
D) indicates a transverse relationship.
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