Mario conducts a study on what Caucasians perceive as physic…
Mario conducts a study on what Caucasians perceive as physically attractive, then conducts the same study with African Americans, and then with Asian Americans as the sample. Mario is using ________ to determine the external validity of his findings.
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A researcher is designing an experiment, and ensures that each participant is equally likely to be in one condition as another. He does not assign them based on any characteristics such as gender, ethnicity, or personality. This researcher is ________ participants.
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