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You may find the EBSCO interface yields more specific results
With EBSCO, you can choose which databases you want to search. For your class, I would suggest the following...
Academic Search Premier
Communication & Mass Media Complete (for some topics)
ERIC (for some topics)
PsycARTICLES (for all of your topics)
PsycINFO (for all of your topics)
Social Sciences Full Text - H.W.Wilson (for all of your topics)
SocINDEX with Full Text (for all of your topics)
Pay attention to the facets on the side. You can use them to change your results quickly. Included limiting to FULL TEXT
CLICK ON THE ARTICLE AND READ THE ABSTRACT AND METHODOLOGY (Note: rarely will an article come out and say it is either "experimental" or "correlational". But use the clues!
TIP: Keep a definition of experimental and correlational studies with you
TIP: Type in the word "experiment" or "experimental", and you might be able to find that elusive experiment!
TIP: You don't have to keep searching and searching ... find an article and look at their sources / references! There is a good chance you will find what you need, including, occasionally, the contradictory argument. Many articles have a literature review section. Note: they might not call it this, but look for that part of the article that covers gives an overview of the research.
You can InterLibrary Loan articles as well if we do not have the full text. The article will usually come in a day or two.