Which of the following best addresses the nature of the threat to internal validity that is caused by attrition?
A) changes in how a variable is measured during the course of the study
B) the differential dropping out of the participants from a study
C) an unexpected or unrelated event occurring during the study that could influence responses
D) physiological changes occurring in participants during the course of the study

Question

Quizplus · Accepted Answer

Attrition refers to participants dropping out of a study over time, which can threaten internal validity by potentially leading to non-random differences between those who remain in the study and those who leave. This can bias the results if the reasons for dropping out are related to the study's outcomes.

Which of the Following Best Addresses the Nature of the Threat