The Partisan Conflict Index (PCI) tracks the degree of political disagreement among U.S. politicians in the federal government. It is found by measuring the frequency of newspaper articles reporting disagreement in a given month. Higher values of the index suggest greater conflict among political parties, Congress, and the President. The data in Table 18 represents the PCI in October from 2000 to 2014.

Construct a time-series plot of the data. In what year was the index highest?

Approach

Step 1 Plot points for each year, with the date on the horizontal axis and the Partisan Conflict Index on the vertical axis.
Step 2 Connect the points with line segments.

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Table 18 Year Partisan Conflict Index (PCI) 2000 85.12 2001 70.46 2002 96.87 2003 94.18 2004 123.41 2005 74.39 2006 80.16 2007 88.88 2008 93.00 2009 90.54 2010 147.52 2011 129.75 2012 147.55 2013 252.10 2014 137.58