Which of the following threats to internal validity is more likely to occur with a longitudinal design?

Question

Quizplus · Accepted Answer

Longitudinal studies involve studying the same participants over an extended period of time. As a result, it is more likely that participants will drop out due to reasons such as moving away, illness, or lack of interest. This can lead to mortality effects, where the sample is no longer representative of the population, and those who drop out may have different characteristics than those who remain in the study. Therefore, B is the most likely threat to internal validity in a longitudinal design.

Which of the Following Threats to Internal Validity Is More