=+51. Gas prices 2012. A driver has recorded and posted on the Internet (www.randomuseless.info/gasprice/gasprice. html) the price

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=+51. Gas prices 2012. A driver has recorded and posted on the Internet (www.randomuseless.info/gasprice/gasprice.

html) the price he paid for gasoline at every purchase from 1979 to 2012. Since 1984 all purchases were self-serve and all were for premium (92-93 octane) gas. He has also standardized the prices to April 1979 dollars. Here are boxplots for 2003, 2006, 2009, and 2012:

M03_SHAR8696_03_SE_C03.indd 117 14/07/14 7:27 AM 118 CHAPTER 3 Displaying and Describing Quantitative Data Year 2.25 3.00 3.75 2003 2006 2009 2012 Price (1979 $)

a) Compare the distribution of prices over the four years.

b) In which year were the prices least stable (most volatile)? Explain.

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