The only research design that allows one to make inferences on cause-and-effect is the ________ design
A) case study
B) correlational
C) experimental
D) naturalistic observation
Answer: C
Rationale: It is the manipulation of variables along with random assignment that allows an experiment to make cause-and-effect conclusions. The other research methods listed do not permit casual inferences.
Psychology
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Cocaine is a stimulant that
a. produces euphoria. c. increases sensitivity to pain. b. increases hunger. d. decreases sexual desire.
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