Question

Suppose a case management program is established to reduce rehospitalization rates in a hospital and that those rates drop dramatically once the new program is established. We can conclude that
a. research has demonstrated an effective approach to practice.
b. causality cannot be inferred because time order was not established.
c. another event occurring during the time of the study might explain away the change.
d. the absence of covariation threatens the internal validity of any causal inferences.

Answer

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