The following table gives the number of organ transplants performed in the United States each year from 1990 to 1999 (The Organ Procurement and Transplantation Network, 2003):
a. Construct a scatterplot of these data, and then find the equation of the least squares regression line that describes the relationship between y = number of transplants performed and x = year. Describe how the number of transplants performed has changed over time from 1990 to 1999.
b. Compute the 10 residuals, and construct a residual plot. Are there any features of the residual plot that indicate that the relationship between year and number of transplants performed would be better described by a curve rather than a line? Explain.

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Number of Transplants (In thousands) 15.0 15.7 16. 1 17.6 18.3 19.4 20.0 20.3 21.4 21.8 Year 1 (1990) 10 (1999)