The more a researcher controls internal validity by restricting the study to participants who are similar to one another, the less of which type of validity will the study generally contain?

Question

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The more a researcher restricts the study to participants who are similar to one another, the less generalizable the findings are to the larger population, which means the study will have low external validity. However, controlling internal validity is still essential, and it refers to the extent to which a study establishes a causal relationship between the independent and dependent variables. Clinical validity and sequential validity are not relevant to the question.

The More a Researcher Controls Internal Validity by Restricting the Study