Could the effect of being clinically depressed on the number of close friendships an individual has be studied in an experimental research design? I think not because the variables cannot be manipulated.

Answer 1

I searched Google under the key words "how depression affects friendships" to get these possible sources:

https://www.google.com/search?client=safari&rls=en&q=clinical+depression+friendships&ie=UTF-8&oe=UTF-8&gws_rd=ssl#q=how+depression+affects+friendships

In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search. Also see http://hanlib.sou.edu/searchtools/.