I am a high school student doing a report for my environmental science course, IB diploma.
My question is about how to find the correlation between two data sets.
My question of interest is whether a city's population density affects the city's air quality, measured in PM 25.
Though I have the research question, I don't really know how to approach it. I am not familiar with statistic analysis and don't know which tool and how I would use to try to answer my question in mind.
I plan to choose around 10 cities and gather the two values for each city from a particular year, from there I guess I can do a graph with the independent value (population density) on x-axis and dependent (air quality measured by PM 25) on the y-axis. Please help me and guide me how I would do from there and whether my choice of the range of data is wise, if not, how can I do?
Thanks a lot!