Experiments lack internal validity when they fail to control for other factors, called ______ that might pose rival hypotheses for the results.
A) confounds
B) placebos
C) blinds
D) alternatives

Question

Quizplus · Accepted Answer

Confounds are factors other than the independent variable that could potentially explain the results, and if not controlled for, can compromise the internal validity of the experiment. Placebos and blinds are not directly related to controlling for confounds. "Alternatives" is too broad and does not provide a clear explanation of the concept being referred to.

Experiments Lack Internal Validity When They Fail to Control for Other