Eyeballing the graph, if Finland has a 563 and Lichtenstein a 522, that's 7.9% higher. The point of a graph is to convey information in a concise and useful ma

Eyeballing the graph, if Finland has a 563 and Lichtenstein a 522, that's 7.9% higher. The point of a graph is to convey information in a concise and useful manner. The pencil graph does no such thing; it obfuscates. It's objectively worse than giving the reader the actual numbers. edit: That said, for any standardized tests, the scores generally don't follow a linear pattern. (From what I understand, they usually follow a normal distribution.) I don't know enough about PISA to even say what a 563 means, and neither does the vast majority of this thing's audience. Without more detail, even that 7.9% isn't helpful.