Conditions randomly sampling participants strategies are ways in which researchers attempt to achieve internal validity in a quasi-experimental study.
A quasi-experiment is an empirical intervention study designed to estimate the causal effects of an intervention on a target population without random attribution.
Quasi-experimental studies are studies that aim to evaluate interventions but do not use randomization. Similar to randomized trials, quasi-experiments aim to demonstrate causal relationships between interventions and outcomes.
In a quasi-experiment, the independent variables cannot be randomly assigned as they are inherent differences in the participants themselves. A memory task by a group of clinically depressed participants compared to a control group of non-depressed participants is a common example in psychology.
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