A dependent variable is what you measure in an experiment to see if it changes due to what you do to the independent variable. Think of it as the "effect" in a cause-and-effect relationship.
In psychology experiments, the dependent variable is the behaviour or response that researchers are interested in observing. For example, if you are testing whether listening to music helps people study better, the dependent variable might be the test scores of the participants. It is called "dependent" because it depends on how the conditions of the experiment are set up.
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