![]() ![]() A researcher can overcome such a situation by first establishing a causal relationship between variables under controlled settings, which imparts high internal validity to the study. While the internal validity of a study increases with higher control of extraneous variables, the generalization of results decreases with such increased control. It is not possible to maximize internal and external validity simultaneously. ![]() However, the same laboratory settings and restricted population lower the external validity as the experiment settings do not match the real world. Such a test can be associated with high internal validity as it is performed in laboratory settings with a restricted population, which minimizes the external influence of confounding variables. The selected sample comprises college-goers. For example,Ī researcher wants to study the effect of exercise on weight loss under laboratory conditions. ![]() The fundamental difference between internal and external validity is that, while the former is concerned with the accuracy of the cause-and-effect relationship between the independent and dependent variables, the latter is related to the universality of the results of a research study. External validity is the extent to which the results of a study can be generalized to other settings, including people, situations, and events. ![]()
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