5.42: Random selection or random assignment: For each of the following hypotheti

Question

5.42: Random selection or random assignment: For each of the following hypothetical scenarios, state whether selection or assignment is being described. Is the method of selection or assignment random? Explain your answer.

A. Study of the services offered by counseling centers at Canadian universities studied 20 universities; every Canadian university had an equal chance of being in this study.

B. In a study of phobias, 30 rhesus monkeys were either exposed to fearful stimuli or not exposed to fearful stimuli. Every monkey had an equal chance of being placed in either of the exposure conditions.

C. In a study of cell phone usage, participants were recruited by including an invitation to participate in the study along with their cell phone bills.

d. In a study of visual perception, 120 Introduction to Psychology students were recruited to participate.

Explanation / Answer

Solution:-
A. In this scenariothe method of random selection is described, since 20 units were selected in such a way that every unit in the population had an equal and independent chance of being in this study.

B. In this scenario the method of random assignment is described, since the units were exposed to any of the two available treatment conditions in such a way that every unit had an equal and independent chance of being placed in either of the exposure conditions.

C. In this scenarioneither the method of random selectionnor the method of random assignmentis described, since no specific procedure was described to select the individuals.

D. In this scenarioneither the method of random selection nor the method of random assignment is described, since no specific procedure was described to select the individuals.

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