How important is internal validity in an experiment?
A) It is less important than external validity.
B) It is less important than random selection.
C) It is less important than sample size.
D) It is the most important property of your experiment.

Question

Quizplus · Accepted Answer

Internal validity is crucial because it determines whether the observed effects in an experiment are due to the manipulation of the independent variable and not other factors. Without internal validity, the results of an experiment cannot be trusted to reflect a true causal relationship.

How Important Is Internal Validity in an Experiment