(Answered) 1 what are the threats to external validity how could each

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1. What are the threats to external validity? How could each threat affect you as a researcher? Come up with a research example for each threat to external validity. What are some methods to increase external validity?

2. What statistical technique would be helpful when you would like to equalize groups on Variable A, which is related to the dependent variable, but are unable to use the matching technique?

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