Jerry's control group is the football team, his experimental...

Jerry's control group is the football team, his experimental group is the baseball team. $\mathrm{He}$ assigned the groups to condition using random assignment. Is there a problem with Jerry's experiment? If so, what is it? Why is it a problem?

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Key Concepts

Random Assignment

Random assignment is a fundamental principle in experimental design where subjects are allocated to different groups (such as control and experimental groups) purely by chance. This process helps ensure that each group is similar in all respects, except for the variable being manipulated, thereby reducing bias and confounding factors.

Group Equivalence

Group equivalence refers to the idea that the groups in an experiment should be comparable before any treatment is applied. In this case, using pre-existing groups (football and baseball teams) may lead to systematic differences between the groups, undermining the assumption that any differences in outcomes can be attributed solely to the experimental manipulation.

Confounding Variables

Confounding variables are extraneous factors that can influence the outcome of an experiment, making it difficult to establish a clear cause-and-effect relationship. When groups are not equivalent—such as when different sports teams with distinct characteristics are used—the differences themselves may act as confounders, potentially biasing the results and compromising the internal validity of the study.

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