The addition of a comparison group can address all of the following threats to internal validity EXCEPT:
A) History
B) Maturation
C) Regression
D) Attrition
E) A comparison group can address all of these threats to internal validity

Question

Quizplus · Accepted Answer

A comparison group cannot address the threat of attrition, which refers to the loss of participants from one group in a study. This can occur for various reasons (e.g. dropping out of a treatment program, moving away), and can affect the internal validity of a study if the attrition is not random or balanced across groups. However, a comparison group can address the other threats to internal validity listed: history (external events that occur during a study), maturation (natural changes that occur over time), and regression (when extreme scores on a measure tend to move closer to the mean on subsequent measurements).

The Addition of a Comparison Group Can Address All of the Following