SAT Math Scores vs Brain Cells &Head Size

Standardized Test Scores vs. # of Brain Cells & Head Size

	SAT math scores increase 6 points for each 1% increase in brain or head size.
	GRE test scores, crime rates, annual incomes, and brain size correlate closely with each other.
	Why the US INS viewed jews as "simple minded ... morons" in 1924.
	The effect of race on earning capacity.
	The volume of gray matter and IQ correlate closely.
	Annual salaries increase by $660 for each 1% increase in brain or head size.

	Brain Size Cubic Centimeters	12th Grade TIMSS Math	12th Grade TIMSS Science	8th Grade TIMSS-R Math	IAEP Math	GRE Quantitative	GRE Verbal	GRE Analytical	Annual Incomes
Asian men	1,472	590	585	614	73.1	638	490	566	$55,358
White men	1,416	575	532	545	65.5	586	512	578	$50,375
Asian women	1,358	480	478	594	72.4	572	484	552	$37,916
White women	1,308	523	490	535	62.8	514	485	556	$34,503
African men	1,319	365	367	280	28.8	446	399	429	$28,075
African women	1,217	348	333	270	27.8	404	388	421	$19,230

Correlation between brain size and intelligence increases from GRE Analytical at r-squared = 0.57, to IAEP Math and GRE Verbal scores at r-squared = 0.58, to TIMSS Math a 0.71, to TIMSS Science at 0.81, to GRE Quantitative at 0.88, to annual earnings at 0.95.

The simple explanation would be that as a test focuses more on intellectual skills and less on memorization questions, it more closely mimmicks a real test of intelligence, and thus correlates more closely with brain capacity. Nobody denies that the bigger a muscle is, the stronger it is, or that the bigger a microcomputer is the more it can process, so why would we deny that the bigger a brain is, the more capacity it has for intellectual challenges and computations?

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The major outlier is black men, which can be explained by any number of factors, and removing them increases r-squared to 0.67 for GRE Verbal, 0.69 for GRE Analytical, 0.71 for IAEP math, 0.84 for TIMSS Math, 0.91 for TIMSS Science, 0.96 for GRE Quantitative, and 0.98 for annual earnings. Following are the graphs with this one outlier removed: