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quasi-experiment
a study that is almost an experiment but lacks key ingredients
the IV has not been determined by anyone
the variables simply exist, e.g. being old or youg
not really an experiment
control - strength
often carried out under controlled conditions and therefore share some strengths of a lab experiment
confounding variables - limitation
cannot randomly allocate participants to conditions and therefore there may be confounding variables
issues with IV - limitation
IV is not deliberately changes and therefore we cannot claim that the IV has caused observed change