Which threat to external ecological validity refers to how events occurring at the time of the intervention or treatment affect the outcome?
A) measurement of the dependent variable
B) interaction between time of measurement and treatment effects
C) interaction between history and treatment effects
D) novelty or disruption effects

Question

Quizplus · Accepted Answer

The interaction between history and treatment effects refers to how specific events that occur outside of the experiment, during the time of the intervention or treatment, can affect the outcome. This can threaten the external ecological validity by making it unclear whether the results are due to the treatment itself or to these external events.

Which Threat to External Ecological Validity Refers to How Events