Experimental studies tend to be high in internal validity, while non-experimental studies tend to be high in external validity.
Due to the manipulation of the independent variable and the restriction of unrelated variables, experiments typically have a high level of internal validity. Studies have a high level of external validity if the findings can be applied to people and circumstances other than those that were the subject of the original study.
Studies have a high level of internal validity if their methodology supports the assertion that any observed differences in the dependent variable were caused by the independent variable. Due to the modification of the independent variable and the restriction of unrelated variables, experiments typically have a high level of internal validity.
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