Performance IQ scores vs. brain size. A study examined brain size (measured as pixels counted in a digitized magnetic resonance image [MRI] of a cross section of the brain) and IQ (4 Performance scales of the Weschler IQ test) for college students.
The scatterplot shows the Performance IQ scores vs. the brain size. Comment on the association between brain size and IQ as seen in the scatterplot on the next page.
