Then it wouldn't be a essay
<span>D. by trying out policies that might later affect the entire nation</span>
Under the Articles of Confederation, the principle of "republicanism" helps explain why the federal government had so little power over the states, since Republicanism stood for strong individual and state rights as opposed to strong federal rights.
In assessing the internal validity of an intervention, we try to determine if certain changes cause certain outcomes. It is relevant in studies that try to establish casual relationship. While in observational or descriptive studies, it is not that relevant. It is also possible to have internal validity in a study and not have construct validity. Example, imagine a study where you are looking at the effects of a new computerized tutoring program on math performance in first grade students.
