Which threat to internal validity occurs when events that occur before or during the experiment affect the relationship being studied?
A) History
B) Maturation
C) Testing
D) Instrumentation
E) Mortality

Question

Quizplus · Accepted Answer

History refers to external events that affect the participants during the course of the experiment, and can threaten internal validity if they are not controlled for. These events may influence the relationship being studied, and can confound the results.

Which Threat to Internal Validity Occurs When Events That Occur