While participating in a timed experiment, the participants in the experimental group had to leave the room because of a fire drill. Which potential threat to internal validity would this example illustrate according to Campbell and his colleagues?
A) maturation
B) selection
C) instrumentation
D) history

Question

Quizplus · Accepted Answer

This is an example of the history threat to internal validity, as an external event (the fire drill) occurred during the study that may have affected the participants' responses.

While Participating in a Timed Experiment, the Participants in the Experimental