The internal validity of a study is high when the researcher can rule out all plausible alternative explanations for the study's findings.

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Internal validity refers to the extent to which a study can demonstrate that a causal relationship exists between the independent and dependent variables, free from the influence of extraneous variables. High internal validity is achieved when the researcher can confidently rule out alternative explanations for the findings, ensuring that the observed effects are due to the manipulation of the independent variable and not other factors.

The Internal Validity of a Study Is High When the Researcher