The mean price per barrel of crude oil and the total fuel cost for the global airline industry are shown in Table 13 for various years.

Let C be the total airline fuel cost (in billions of dollars) in the year that is t years since 2005, For example, t = 0 represents 2005, and t = 2 represents 2007.
a. Identify the explanatory and response variables.
b. Construct a scatterplot that compares the years and the total airline fuel costs.
c. For which of the years shown in Table 13 was the total airline fuel cost the least? What was that cost?
d. For which of the years shown in Table 13 was the total air- line fuel cost the greatest? What was that cost?
e. For the years shown in Table 13, was the total fuel cost the greatest in the same year that the mean price per barrel was the greatest? Explain why this is possible.

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Table 13 Mean Price per Barrel of Crude Oil and Total Fuel Cost for the Global Airline Industry Mean Price per (dollars) 73 62 Barrel of Crude OilTotal Airline Fuel Cost Year 2007 2008 2009 2010 2011 (billions of dollars) 133 187 123 138 174 79