The quality of an experiment is judged by its internal validity. When we say that an experiment is internally valid, it means that
A) our operational definitions of the dependent and independent variables accurately capture the concepts those variables are meant to represent.
B) within the context of the experiment, each time we take a measure of the dependent variable from a participant, we get roughly the same result.
C) our operational definitions of variables are valid, but only within the context of that one experiment.
D) we can confidently state that any observed changes in the dependent variable result from manipulations of the independent variables) and nothing else.

Question

Quizplus · Accepted Answer

Internal validity refers to the extent to which a study can demonstrate that a cause-and-effect relationship exists between the independent and dependent variables, excluding the possibility that the observed effects are due to extraneous variables.

The Quality of an Experiment Is Judged by Its Internal