When reviewing research that you have found, start by reading the abstract in order to identify the methodologies used in the study. Research articles should also include a section that describes the methods used in more detail.
Not all quantitative or qualitative studies will include the same clues present in the examples on this page. Read articles carefully to understand the methodologies used.
This abstract has several indications that this is a quantitative study:
This abstract has several indications that this is a qualitative study: