A researcher was conducting an experiment on a new method to reduce fear of flying and did not use a control group.During this experiment,a high-profile plane crash was reported in the media.What threat to internal validity is this?
A)history
B)experimental mortality
C)selection biases
D)testing
E)statistical regression

Question

Quizplus · Accepted Answer

The high-profile plane crash reported in the media is considered a historical event that could potentially affect the outcome of the experiment. Since there was no control group, it is impossible to determine whether the fear reduction method had any effect or if the results were caused by the external factor of the plane crash.

A Researcher Was Conducting an Experiment on a New Method