Sales of automobiles in the United States fluctuate from month to month and year to year. The

Question:

Sales of automobiles in the United States fluctuate from month to month and year to year. The data in the file AutoSales represent the sales for various manufacturers in July 2013 and the change from July 2012 sales in percentages. (Data extracted from www.nytimes.com/interactive/2013/08/01/business/How-the-Auto-Industry-Fared-in July.htm.)
a. Construct a treemap of the sales of autos and the change in sales from July 2012.
b. What conclusions can you reach concerning the sales of autos and the change in sales from July 2012?