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Eduncle Best Answer
Ex post facto design is a quasi-experimental study examining how an independent variable, present prior to the study, affects a dependent variable. But first, quasi-experimental simply means participants are not randomly assigned. In a true experiment, you have what is called random assignment, which is where a participant has an equal chance of being in the experimental or control group. Ex post facto experimental research is much less rigorous than what could be achieved in the laboratory - if laboratory research were possible on the particular subject.