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Internal validity is a term that researchers use to refer to the relationship that exists between a cause as a reliable result in an investigation.
On the other hand, external validity is a term that researchers use to refer to the variability that a result can have if the same study is applied in another context.
According to these definitions, it can be established that the other statements about the generalization and variation of variables are correct because they state real facts related to the researchers' consideration of the validity of the results of an investigation.
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