An experiment has internal validity when
A) the dependent variable is measured reliably.
B) the dependent variable is valid.
C) only the independent variable could have caused the results.
D) the independent variable is strongly manipulated.

Question

Quizplus · Accepted Answer

Internal validity refers to the extent to which a study can attribute changes in the dependent variable to the manipulation of the independent variable, rather than to other factors. Therefore, only the independent variable could have caused the results is the correct option. The other options are related to the reliability and validity of the dependent variable, which are important but do not determine the internal validity of the study.

An Experiment Has Internal Validity When