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Application: External Validity
You now know that validity helps tell you if an experiment measures what you think it measures. In the Discussion for this week, you addressed one of the internal threats to validity, that is, confounding variables. This Application Assignment will challenge you on external threats to validity. Generalization is the underlying issue in external validity. If a research study is only valid for the sample used in the study, it is not very helpful to the study of psychology.
In the example given in the Discussion, students tried different study strategies. Suppose you were struggling with a concept in a training class at work and wanted to try a study strategy. Imagine that the Instructor in the Discussion solved the internal validity problem and found that study Strategy 1 worked better than study Strategy 2. Remember that your Instructor’s study included a population of online students. You assume that the results of this study will generalize to your training class at work. However, a replication of this study found that study Strategy 1 only works well for online students in an undergraduate program. It cannot be generalized to your in-class training course at work. Therefore, it does not generalize across settings.
The questions in this week’s Application Assignment will help you think through generalizations as well as replications, both of which relate to external validity.
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