The value of a National Basketball Association (NBA) franchise has increased dramatically over the past few years. The value of a franchise varies based on the size of the city in which the team is located, the amount of revenue it receives, and the success of the team. The file NBA Values contains the value of each team and the change in value in the past year. (Data extracted from www.forbes.com/nba valuations.): 

a. Construct a treemap that visualizes the values of the NBA teams (size) and the one year changes in value (color). 

b. What conclusions can you reach concerning the value of NBA teams and the one year change in value?