When participants begin an experiment but fail to complete it,the internal validity of the experiment can be threatened.Which of the following types of subject loss poses the most serious threat to internal validity?

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When participants begin an experiment but fail to complete it due to some characteristic of the participant that is related to the outcome of the study, it poses the most serious threat to internal validity. This is because the missing data may introduce bias and affect the results of the study. It may also lead to unequal group sizes and affect the statistical analysis of the data. Therefore, researchers need to take steps to minimize subject loss and find ways to handle missing data to preserve the internal validity of the study.

When Participants Begin an Experiment but Fail to Complete It,the