Confounding Variable
An uncontrolled factor that influences both the independent and dependent variables, creating a misleading association between them.
A confounding variable is a third factor related to both the presumed cause and the outcome, making it look as though one causes the other. If motivated students both choose a new study app and earn higher grades, motivation confounds the app's apparent effect. Researchers address confounding through random assignment, matching, restriction, or statistical control, such as including the confounder in a regression model.
In a thesis, anticipating confounders shows methodological maturity. Identify plausible ones during design, explain in the methodology chapter how each is handled, and acknowledge the rest in the limitations section. Examiners often probe causal claims by proposing alternative explanations, so a discussion that names likely confounders and the direction of their bias defends your conclusions before the question is even asked.
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