Discussion
Ex Post Facto research :
Answer: B
Ex post facto research has no control over variables.
'Ex post facto' means 'after the fact'. The researcher studies effects that have already occurred and looks back for their possible causes, for example comparing children from different family types. Because the independent variable has already acted, it cannot be manipulated or controlled.
Manipulating variables is the mark of an experiment. Assessing the impact of an intervention is evaluation research, and while ex post facto studies often use correlational analysis, the defining feature is the lack of control.
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