I would say to find something that affects your community or your school. Perhaps a social science idea?

I live in NYC and there are people from all over the world here. I would do something like ask different people that are commonly grouped together questions about racism, races, income, etc etc… Then see how people fare across the board

Did women answer commonly vs men? Did Asians answer commonly vs. Blacks?

Then whatever common answers you have, you can draw conclusions from what their collective perceptions are and see if stereotypes or common beliefs are true.

Just something off of the top of my head. Doesn’t require a lot of equipment – probably good and thorough planning.