Does the size of a transplanted organ matter? A study that attempted to answer this question (“Minimum Graft Size for Successful Living Donor Liver Transplantation,” Transplantation [1999]:1112– 1116) presented a scatterplot much like the following (“graft weight ratio” is the weight of the transplanted liver relative to the ideal size liver for the recipient):

a. Discuss interesting features of this scatterplot.

b. Why do you think the overall relationship is negative?