Suppose you just read a careful statistical study of the effect of improvedhealth of children on their test scores at school. Using data from a project in aWest African district, in 2000, the study concluded that students who receivedmultivitamin supplements performed substantially better at school. Use theconcept of external validity to determine if these results are likely to apply toIndia in 2000, the United Kingdom in 2000, and West Africa in 2015.

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