Why Do the Groups Have to Be Equivalent at the Start

question 84

Multiple Choice

Why do the groups have to be equivalent at the start of an experiment?

• A) If the groups are not equivalent at the start of an experiment, the experiment is contaminated by ethnocentrism.
• B) If the groups are not equivalent at the start of an experiment, demand characteristics are more likely.
• C) If the groups are not equivalent at the start of an experiment, it is impossible to conduct a replication.
• D) If the groups are not equivalent at the start of an experiment, we cannot be certain that the IV caused any difference observed in the DV.

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