Peer review isn't a tough concept. It just means that the article was reviewed by scholars and meets certain standards with regards to a publication or a discipline
Peer reviewed/scholarly articles are typically written by professors or specialists.
A great clue that something is peer reviewed or scholarly: The article contains a list of references or cites.
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Sample groups too small to analyze using statistics
Produces numerical results/ analyzed statistically
An article that provides an overview of important research on a particular topic
Reviews several quantitative studies analyzing them looking for patterns/ trends within data
May involves experimentation
Considered scholarly but not primary research/ no new study is conducted
Uses existing studies
Usually considered another form of quantitative research