When a confounding variable is present in an experiment, _____.
A)internal validity can be assumed
B)external validity can be assumed
C)internal validity is challenged
D)external validity is challenged

Question

Quizplus · Accepted Answer

Confounding variables are extraneous factors that can affect the outcome of an experiment, making it difficult to determine whether the independent variable or the confounding variable caused the observed effect. As a result, the internal validity of the experiment is challenged because it is unclear whether the experiment actually tested what it set out to test.

When a Confounding Variable Is Present in an Experiment, _____