Which of the methods of research control described in this chapter were used to control confounding variables?

This question applies to Nursing Research> Chegg server will not allow me to attach pdf. file or Microsoft document of this article but it is free to access on PubMed website, www.PubMed .com. When I try to upload pdf or Microsoft file I get this message: www.chegg.com says: image upload error image url unavailable in media service response.

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Look up article: Translation and Validation of the Dietary Approaches to Stop Hypertension for Koreans Intervention: Culturally Tailored Dietary Guidelines for Korean Americans With High Blood Pressure

Read the methods and results sections of the report by Kim et al., (Dietary approaches to stop hypertension).

Answer the following questions:

1) Is the design for this study experimental, quasi-experimental, or non-experimental?

2) What were the independent and dependent variables in this study?

3) Was randomization used? What was the unit of randomization?

4) Which of the methods of research control described in this chapter were used to control confounding variables?

5) Could history be a threat to the internal validity of this study?

6) Was there any attrition in this study?