Assess the Relationship between Immigration Status and Drug Use.

I am going to attach the article you need to read in order to write this critique. This is a research critique and these are the following questions that need to be answered throughly.
1. What control variables were included in the study?
a. How are they theoretically relevant?
2. What is the unit of analysis?
3. Discuss, in detail, the sampling plan. How was this data collected?
a. What is the sampling frame?
b. What is the sample size?
c. Do you have any concerns about the validity and reliability of the data?
4. How could the methodology have been improved?

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