An experiment is internally valid if:

Question

Quizplus · Accepted Answer

Internal validity refers to the extent to which an experiment can attribute the observed effects to the independent variable and not to any other confounding variables. Therefore, the best choice for internal validity is A, as it indicates that the outcome can only be attributed to the independent variable. B is incorrect, as external validity refers to the extent to which the results generalize to other settings. C is incorrect, as this indicates that confounding variables may have influenced the results, which would decrease internal validity. D is incorrect, as operational definitions refer to how variables are measured, which is important for both internal and external validity, but is not the same as internal validity itself.

An Experiment Is Internally Valid If