The sub-prime mortgage crisis that hit the world economy also impacted the real estate market….

 The sub-prime mortgage crisis that hit the world economy also impacted the real estate market. Both new and existing home sales were affected. A file titled EHSales contains the number of existing homes sold (in millions) from September of 2007 to September 2008.

a. Construct a line plot for these data.

b. The data file also contains data concerning the median selling price ($thousands). Construct a graph containing the line plot for both the number of sales (tens of thousands) and the median ($thousands) price of these sales for the indicated time period.

c. Describe the relationship between the two line plots constructed in part b.