Which of the following threats to validity is the MOST concerning with the nonequivalent control group design?
A) Selection interactions
B) Instrumentation
C) Mortality
D) Testing

Question

Quizplus · Accepted Answer

The nonequivalent control group design is known to have potential selection bias, as the control group is not randomly assigned. This means that the groups may differ in important ways before the intervention is even introduced, leading to selection interactions as the most concerning threat to validity. Instrumentation refers to changes in the measurement tool over time, mortality refers to participants dropping out of the study, and testing refers to participants becoming more familiar with the test over time. While these are all potential threats to validity, they are less concerning than selection interactions with the nonequivalent control group design.

Which of the Following Threats to Validity Is the MOST