Carbon dioxide (CO2) is produced by burning fossil fuels such as oil and natural gas, and has been connected to global warming. The following table presents the average amounts (in metric tons) of CO2 emissions for the years 1997–2013 per person in the United States and per person in the rest of the world.

a. Compute the least-squares regression line for predicting U.S. emissions from non-U.S.
emissions.

b. If the non-U.S. emissions differ by 0.2 from one year to the next, by how much would you predict the U.S. emissions to differ?

c. Predict the U.S. emissions for a year when the non-U.S.
emissions level is 3.4.

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Year Non-U.S. U.S. 1997 3.4 20.0 1998 3.3 19.5 1999 3.2 19.6 2000 3.3 20.0 2001 3.3 19.6 2002 3.3 19.6 2003 3.5 19.4 2004 3.7 19.6 2005 3.8 19.5 2006 3.7 19.0 2007 4.7 19.2 2008 4.7 18.5 2009 4.6 17.2 2010 4.6 17.5 2011 5.0 17.0 2012 5.0 16.3 2013 5.0 16.4