The pretest scores can help reduce the threat of assignment bias. This is one of the primary advantages of a pretest-posttest nonequivalent control group design, in comparison to other nonequivalent group designs
When analyzing research data, the term "assignment bias" is used to describe elements that may skew a study's findings. Assignment bias occurs when the characteristics of experimental groups differ significantly as a result of a flawed assignment procedure.
When administering a series of IQ tests, one group may contain a greater proportion of individuals who score much higher than the other. Due to the fact that it permits two distinct explanations for variations in treatment results, assignment bias might pose a danger to internal validity. Selection bias can also happen during a study if a large percentage of participants drop out before finishing it.
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