The graph above (many thanks to one of my Indonesian colleagues who made it look prettier) shows my current Junior/Senior level "Economic Development of Latin America" students' exam performance (x-axis), with their homework performance (y-axis).
Homework "is entirely voluntary, 10% extra credit, and designed as exam preparation." The homework is basically a voluntary curve. I refuse to arbitrarily curve their work.
I am aware that an excel graph is in no way a rigorous statistical analysis, and I cannot really draw any causality from this (correlation maybe) without some serious econometric mumbo-jumbo. But I do have two words for you:
Selection bias.
Enjoy the pretty colors and dots.
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