Nothing to see here

Some graphics are made to inform, some to amuse, some to delight. But the following scatter plot makes one wonder why why why...

What does the designer want to say?

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I saw this chart inside an infographics titled "Where in the World are the Best Schools and the Happiest Kids?", via the Cool Infographics blog. The horizontal axis is happiness and the vertical axis is average test score.

So it appears that happy kids can get the best and the worst test scores, and kids with the best test scores can be both happy and sad.

That means the happiness of kids does not depend on their test scores.