Living-donor kidney transplants are becoming more common. Often a living donor has chosen to donate a kidney to a relative with kidney disease. The following data appeared in a USA Today article on organ transplants (“Kindness Motivates Newest Kidney Donors,” June 19, 2002):

Year Number of Kidney Transplants Living-Donor to Relative Living-Donor to Unrelated Person 1994 2390 202 1995 2906 400 1996 2916 526 1997 3144 607 1998 3324 814 1999 3359 930 2000 3679 1325 2001 3879 1399

a. Construct a time-series plot for the number of living-donor kidney transplants where the donor is a relative of the recipient. Describe the trend in this plot.

b. Use the data from 1994 and 2001 to construct a comparative bar chart for the type of donation (relative or unrelated). Write a few sentences commenting on your display.