Which of the following aspects is critical the experimental but not correlational design?
A) the ability to test predictions.
B) the use of variables.
C) the use of operational definitions.
D) random assignment.
Answer: D
Rationale: All research methods generally use variables, operational definitions, and can be used to test predictions made by theories. The experimental method, however, is the only type of research that involves random assignment.
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a. Aristotle b. Galen c. Descartes d. Herophilus
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