The issue of generalizability involves what are called threats to internal validity.

Question

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Generalizability is concerned with the extent to which the results of a study can be applied to or affect others in settings or conditions beyond the study, which relates to external validity, not internal validity. Internal validity refers to how well an experiment is done, especially whether it avoids confounding (i.e., ensures that the change in the dependent variable is due to the independent variable).

The Issue of Generalizability Involves What Are Called Threats to Internal