A ____________ is a threat to internal validity when groups in an experiment are not equivalent at the beginning of the experiment with regard to the dependent variable.

Question

Quizplus · Accepted Answer

Selection bias is the correct term for a threat to internal validity that occurs when groups in an experiment are not equivalent at the beginning of the experiment with regard to the dependent variable. This can happen if participants are not randomly assigned to groups, leading to an imbalance that can affect the outcome of the experiment.

A ____________ Is a Threat to Internal Validity When Groups