78 Chapter 2 Graphical Summaries of Data 1000 800 600 400 200 0 1999 2000 2001 2002 2003 2004 2005 2006 2007 Frequency (millions sold) 1000 900 800 700 600 500 1999 2000 2001 2002 2003 2004 2005 2006 2007 Frequency (millions sold) (A) (B) Choose one of the following options, and explain why it is correct: (i) Graph A presents an accurate picture, and graph B exaggerates the decline. (ii) Graph B presents an accurate picture, and graph A understates the decline. 6. Computer sales: Worldwide sales of computers have been increasing every year. The following bar graph and time-series plot both present a picture of the increase for the years 2005–2008. (The value for 2008 is a projection.) Which of the two graphs presents the more accurate picture? Why? (Source: IDC Worldwide Quarterly PC Tracker) 350 300 250 200 150 100 50 0 2005 2006 2007 2008 Frequency (millions sold) 2005 2006 2007 2008 320 300 280 260 240 220 200 Frequency (millions sold) (A) (B) 7. Stock market crash: The Dow Jones Industrial Average reached its highest level ever on October 9, 2007, when it closed at $14,164.53. One year later, on October 9, 2008, the average had dropped almost 40%, to $8,579.19. Which of the following graphs accurately represents the magnitude of the drop? Which one exaggerates it? October 9, 2007 October 9, 2008 15,000 12,000 9000 6000 3000 0 October 9, 2007 October 9, 2008 Dow Jones Industrial Average ($) (A) (B) 8. Save your money: In August 2008, U.S. residents saved a total of $184 billion. In August 2009, that amount approximately doubled, to $392 billion. Which of the following graphs compares these totals more accurately, and why? (Source: Bureau of Economic Analysis) 2008: $184 billion 2009: $392 billion 2008: $184 billion 2009: $392 billion (A) (B)
navidi_monk_essential_statistics_1e_ch1_3
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