Principle 23 of the "principles of data interpretation" that organize "Reading Educational Research: How to Avoid Getting Statistically Snookered," reads "If the situation really is as alleged ask, 'So what?'" The question does not call for some smart-ass response, it calls for an evaluation of the consequences of the situation. So the U. S. is not #1 in mathematics or science testing. So what? So, very little.
First, comparing nations on average scores is a pretty silly idea. It's like...
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