In a nonequivalent group design, it is possible that some local event could differentially affect our treatment and comparison groups. This threat to internal validity is known as
A) maturation.
B) instrumentation.
C) an interaction between selection and history.
D) an interaction between selection and instrumentation.

Question

Quizplus · Accepted Answer

An interaction between selection and history occurs when an external event affects the groups differently due to pre-existing differences, threatening internal validity.

In a Nonequivalent Group Design, It Is Possible That Some