a. Steps to create a scatter plot to identify the best model by using a graphing utility.

1. Set corresponds to the year 1990 so that corresponds to the year 1995

2. Set the window of the scatter plot as

3. Use table graph feature and enter the corresponding tabular values as shown below: Here denote the number of years from 1995 to 2150 and denote the world population of United Nations in millions.

5	5666	85	6402
10	6028	110	5153
35	7275	135	4074
60	7343	160	3236