Section 2.1 Graphical Summaries for Qualitative Data 41 Table 2.5 Sizes of Sectors for Pie Chart of Computer Sales Data Type of Computer Frequency Relative Frequency Size of Sector Desktop 11 0.22 79◦ Laptop 23 0.46 166◦ Notebook 9 0.18 65◦ Tablet 7 0.14 50◦ Computer Sales Tablet 14.0% Notebook 18.0% Desktop 22.0% Laptop 46.0% Figure 2.4 Pie chart for the computer data in Table 2.5 Figure 2.4 presents the pie chart. Constructing pie charts by hand is tedious. However, many software packages, such as MINITAB and Excel, can draw them. Step-by-step instructions for constructing a pie chart in MINITAB and Excel are presented in the Using Technology section on page 43. Check Your Understanding 2. The following table presents a frequency distribution for the number of cars and light trucks sold in the month of May 2008. Type of Vehicle Frequency Small car 334,053 Midsize car 338,328 Large car 12,920 Luxury car 109,961 Minivan 85,157 SUV 124,507 Pickup truck 174,523 Cross-over truck 217,516 Source: The Wall Street Journal a. Construct a bar graph. b. Construct a relative frequency distribution. c. Construct a relative frequency bar graph. d. Construct a pie chart. 3. The following bar graph presents the number of refugees admitted to the United States between October 2004 and October 2005 from each of the top six countries. 12,000 10,000 8,000 6,000 4,000 2,000 0 Somalia Laos Russia Cuba Haiti Iran Frequency Number of Refugees to U.S. Source: CIA — The World Factbook a. Which country provided the greatest number of refugees? b. Someone says that Cuba provided more refugees than Haiti and Iran together. Is this correct? Explain how you can tell.
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