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quantitative research

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I am having problems trying to identify 2 threats to internal validity and external validity of the study design of this research article.

I am also trying to determine what the extraneous variables of the study are and what measures were used to control them for this research article.

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https://brainmass.com/health-sciences/nursing-research-methods/quantitative-research-377446

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Threats to internal validity and external validity of the study design of this research article are fully summarized in this solution.

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