82 Chapter 2 Graphical Summaries of Data a. Which was the most frequently given answer? b. True or false: Less than one-fourth of the respondents said that they trusted their doctor completely. c. True or false: More than half of the respondents said that they trusted their doctor either a little or not at all. d. A total of 2719 people responded to this question. True or false: More than 500 of them said that they completely trusted or mostly trusted their doctor. 2. Plasma TVs: The following relative frequency distribution presents the market share for several plasma TV vendors in the fourth quarter of 2007. TV Vendor Market Share (percent) Panasonic 37.1 Samsung 19.7 LG Electronics 12.7 Hitachi 6.5 Vizio 5.5 Philips 5.2 Pioneer 4.6 Others 8.7 Source: www.itfacts.biz a. Construct a relative frequency bar graph. b. Construct a pie chart. c. True or false: The top two vendors have more than 50% of the market share between them. 3. Poverty rates: The following table presents the percentage of children who lived in poverty in several Colorado counties in 2000 and in 2008. County Percent in 2000 Percent in 2008 Adams 11.4 18.7 Arapahoe 7.3 13.7 Boulder 8.0 9.3 Denver 20.8 27.3 El Paso 10.4 15.7 Jefferson 6.2 11.2 Source: Colorado Childrens’ Campaign a. Construct a side-by-side bar graph for these data. b. True or false: The poverty rate was higher in 2008 than in 2000 for each of the counties. c. Which county had the greatest increase? 4. Do your homework: The National Survey of Student Engagement asked a sample of college freshmen how often they came to class without completing their assignments. Following are the results: Response Percent Never 35 Sometimes 48 Often 12 Very often 5 a. Construct a relative frequency bar graph. b. Construct a pie chart. c. True or false: More than half of the students reported that they sometimes come to class without completing their assignments. 5. Quiz scores: The following frequency histogram presents the scores on a recent statistics quiz in a class of 50 students. 3 4 5 6 7 8 9 10 14 12 10 8 6 4 2 0 Frequency Score
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