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.

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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