Brain Size A data set in Appendix B includes brain volumes from 10 pairs of monozygotic (identical) twins. The data were collected by researchers at Harvard University, Massachusetts General Hospital, Dartmouth College, and the University of California at Davis. What is the purpose of collecting brain volumes from monozygotic twins?
1) To study the relationship between brain size and genetic factors
2) To compare brain volumes of monozygotic twins with dizygotic twins
3) To determine the effect of environmental factors on brain size
4) To investigate the correlation between brain size and intelligence
