To be a history threat,the external event must occur:
A) Constantly during the experiment
B) At the beginning of the experiment
C) Systematically, affecting most members of the group
D) Intentionally, affecting most members of the group
E) Because of a participant's behavior

Question

Quizplus · Accepted Answer

A history threat occurs when an external event systematically affects most members of the group, making it difficult to determine if any differences in the dependent variable are due to the treatment or the external event. The event does not have to occur constantly or at the beginning of the experiment, nor does it have to be intentional or caused by a participant's behavior.

To Be a History Threat,the External Event Must Occur