Essay about correlation between money invested into education vs GDP per capita

I'm part of a math group. In my group, we had to choose a maths subject to study. I chose Pearson's r correlation. I have to present this project to my math group. I have decided to investigate the correlation between money invested into education and the GDP per capita. I need to use the United Nations website. Graphs and pictures is a good visual so that the rest of my math group can better understand. It's not supposed to be written like a presentation, but more like an investigation essay.