The design of this research must focus around the testability of depression and how these symptoms can manifest within the test subjects. A case study done between these two groups of black males will be helpful in finding a relationship between smoking and depression. Role as a Researcher

The role of the researcher is to find truth and balance within examined data. It is important for the researcher to maintain ethical and moral standards especially in dealing with sensitive information contained in medical records that involve the sensitive subject of mental health and depression. Validity issues must be addressed as well, that is why it is important that proper statistical inferences are drawn using the prescribed techniques and formulas that are designed...

Dealing with subjective information such as depression and mental states, further requires the researcher to have a solid approach with scientific rigor beyond approach.
References

Fox, M. (2010). Survey shows how depression and smoking intertwine. Reuters, 14 Apr 2010. Retrieved from http://www.reuters.com/article/2010/04/14/us-depression-smoking- idUSTRE63D48O20100414

Mendelsohn, C. (2012). Smoking and depression, a review. Australian Family Physician, 2012 4 May, 41(50):304-7. Retrieved from http://www.ncbi.nlm.nih.gov/pubmed/22558621