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What are the threats to internal validity in the following examples? a
What are the threats to internal validity in the following examples?
a. Very obese individuals who go to a weight control clinic will likely show some loss of weight even if the weight control treatment has no effect.
b. A longitudinal study of the effectiveness of a study skills treatment followed a group of college students. The results showed that the seniors had a fi nal mean grade point average higher than they had as freshmen
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