Experimenter bias and participant reactivity can threaten both internal and external validity.

Question

Quizplus · Accepted Answer

Experimenter bias and participant reactivity can both introduce errors in the experiment, potentially invalidating the results. Experimenter bias occurs when the experimenter's expectations or beliefs influence the study's outcome or interpretation, while participant reactivity occurs when participants' behavior or responses are affected by the fact that they know they are being studied. These factors can impact both internal validity (the accuracy of the study's conclusions about cause and effect) and external validity (the generalizability of the study's results to other contexts or populations).

Experimenter Bias and Participant Reactivity Can Threaten Both Internal and External