The following data show the number of rental cars in service for three rental car corporations: Henz, Avis and Dollar. The data are  for the years 2007-2010 and are in thousands of vehicles (auto Rental News website, May 15, 2011)           Company 2007 2008 2009 2010 Hentz 327 311 286 290 Dollar 167 140 106 108 Avis 204 220 300 270   Construct a time series graph for years 2007 and 2010 showing the number of rental cars service for each company. Show the time series for all three companies on the same graph Comment on who appears to be the market share leaders and how market shares are changing over time. Construct a bar chart showing rental cars in service for 2010. Is this chart based on cross sectional or time series data?

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