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Is there a relationship between brain size and intelligence? The Performance IQ scores (PIQ) and brain sizes (in pixels, as measured by MRI scans) of

Is there a relationship between brain size and intelligence? The Performance IQ scores (PIQ) and brain sizes (in pixels, as measured by MRI scans) of 40 subjects were measured. Researchers used simple linear regression to study the relationship between PIQ and brain size, using brain size to predict PIQ. They obtained the following results.

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Analysis of variance Source if Sum of squares Model 2946.6 Error 38 16746.4 R-square = 0.15 Parameter estimates Variable dif Parameter Standard error estimate Intercept 1.74 42.39 Brain size 0.0001203 0.0000465

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