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In experimental research, a null result occurs when the collected data reveal no statistically significant effect of the manipulation of the independent variable on the dependent variable.

Null Result

When an experiment yields a null result—indicating no significant effect of the independent variable on the dependent variable—a manipulation check becomes essential. It helps researchers differentiate between two possibilities: either the independent variable genuinely has no effect on the dependent variable, or the experimental manipulation itself failed to alter the independent variable as intended.

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