Brain Size and Intelligence. The table below lists brain sizes (in cm3

) and Wechsler IQ scores of subjects (based on data from “Brain Size, Head Size, and Intelligence Quotient in Monozygatic Twins,” by Tramo et al, Neurology, Vol. 50, No. 5). Is there sufficient evidence to conclude that there is a linear correlation between brain size and IQ score? Does it appear that people with larger brains are more intelligent?

a. Construct a scatterplot for the data.

b. Briefly characterize the correlation in words and estimate the correlation coefficient.

c. Do these data suggest that people with larger brains are more intelligent? Explain.

Brain Size IQ Brain Size 10 965 90 1,077 97 1,029 85 1,037 124 1,030 86 1,068 125 1,285 102 1,176 102 1,049 103 1,105 114