A threat to internal validity in a cross-over design is

Question

Quizplus · Accepted Answer

Since cross-over design begins with a single group of study participants, the order in which two different interventions are administered is randomized within the group. Therefore, there is potential for threats to internal validity due to carry-over effects on the participants from one intervention to another. History and maturation refer to internal validity threats when a study is conducted for a long time or the history of the participant may impact perceptions.

A Threat to Internal Validity in a Cross-Over Design Is