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A psychological study involves systematic investigation or research conducted by psychologists to explore various aspects of human behavior, cognition, emotions, or mental processes using scientific methods.
The specific plan outlining how variables will be manipulated and measured in order to test hypotheses.
A group in an experiment that does not receive any treatment or manipulation so its results can be compared with those who do receive treatment.
The variable manipulated by researchers in an experiment to determine its effect on other variables.