External Validity: A Comparison of Studies A, B, C and D.
External validity is an important concept in research and studies. It refers to the degree to which results of a study can be generalized outside of the specific population and context in which the study was conducted (Fowler, 2021). In order to determine which of the studies A, B, C and D most likely demonstrates external validity, it is important to look at the populations and contexts in which each study was conducted. Study A was a breast screening test on women with BRCA gene mutation. The population of this study was limited to women with the BRCA gene mutation, and the results of the study cannot be generalized to the general population. Therefore, study A does not demonstrate external validity. Study B was a randomized control study of the general population testing vaccine efficacy. This study was conducted on a representative sample of the general population, and the results of the study can be generalized to the wider population. Thus, study B demonstrates external validity. Study C was a reading aptitude test for fourth graders at a high-income school. The population of this study was limited to fourth graders at a high-income school, and the results of the study cannot be generalized to the wider population. Therefore, study C does not demonstrate external validity. Study D was a survey of career interests at an all-male university. The population of this study was limited to male students of a university, and the results of the study cannot be generalized to the wider population. Therefore, study D does not demonstrate external validity. Cont….
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