A social science student, likely in their early years of study, possibly in an introductory research methods course, who is taking detailed notes on the fundamentals of research methodology and data collection techniques in a field such as psychology or sociology.
Wow, I just learned about stratified sampling, and I'm kind of blown away by how it's used to make sure you get a really representative sample of the population; feels like a total brain-gain moment amidst all this physical exertion.