Without internal validity, an experimenter cannot
A) control extraneous variables.
B) manipulate the independent variables).
C) measure the dependent variable.
D) make statements about cause and effect.

Question

Quizplus · Accepted Answer

Internal validity is crucial for establishing a causal relationship between the independent and dependent variables in an experiment. Without it, researchers cannot confidently assert that changes in the independent variable caused any observed changes in the dependent variable, thus hindering their ability to make cause-and-effect statements.

Without Internal Validity, an Experimenter Cannot