A famous social scientist tells you that the most important task in her research was entering the social world of the people she was studying. What can you say about this researcher

She's a qualitative researcher.

Explanation:

Qualitative researcher refers to a a type of researcher who predominantly use non-numerical (non-countable) data as their main source.

For social scientist, most of their data comes in the form of emotion and personal perspective from the people that come from various background in society. These emotion and personal perspective is not something that we can count with numerical method.

Which is why we can say that she's a qualitative researcher.