The table in the next column lists the median weekly earnings (in dollars) for full-time wage and salary workers over the years 2007-2015, categorized by gender.

a. Compute a simple index for the weekly earnings of male workers over the period 2007-2015. Use 2007 as the base year. Do the same for women workers.

b. Plot the two simple indexes on the same graph and interpret the results.

c. Compute a simple composite index for male and female weekly earnings over the 2007-2015 period. Use 2007 as the base year.

d. Plot the simple composite index on a graph and interpret the results.

Year Men Women 766 2007 2008 614 638 798 2009 2010 2011 2012 2013 819 824 831 854 861 657 670 683 691 706 2014 870 894 719 726 2015