How Does the Pretest-Posttest Control-Group Design Control for the Problem

question 84

Multiple Choice

How does the pretest-posttest control-group design control for the problem of selection?

• A) Participants are randomly assigned to groups, so we can assume that the groups are equivalent before the experiment.
• B) Participants are randomly selected, so we can assume that the groups are equivalent before the experiment.
• C) There is a placebo group, so we can assume that demand characteristics are controlled.
• D) There are two more groups in the experiment, so external validity is increased.

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