The Energy Information Administration of the U.S. Department of Energy provided time series data for the U.S. average price per gallon of conventional regular gasoline between January 2007 and February 2014 (Energy Information Administration website, March 2014). Use the Internet to obtain the average price per gallon of conventional regular gasoline since February 2014.

a. Extend the graph of the time series shown in Figure 1.1.

b. What interpretations can you make about the average price per gallon of conventional regular gasoline since February 2014?

c. Does the time series continue to show a summer increase in the average price per gallon? Explain