SECTION 2.2 More Graphs and Displays 63 Using and Interpreting Concepts Graphical Analysis In Exercises 13 –16, give three observations that can be made from the graph. 13. Number of users (in millions) 500 1000 1500 2000 2500 3000 Site Worldwide Monthly Active Users on 5 Social Networking Sites as of January 2021 Instagram WhatsApp WeChat TikTok Facebook 14. Automotive sales (in millions) Year U.S. Annual Automotive Sales 2013 2014 2015 2016 2017 2018 2019 2020 14 15 16 17 18 (Source: Statista) 15. The Multitasker 8% Other 6% The Tailgater 14% The Speeder 5% The Drifter 5% The Crawler 8% The Swerver 8% The Left-Lane Hog 11% Least Popular American Drivers The Texter 22% The Last-Minute Line-Cutter 13% 16. Households (in millions) 10 20 30 40 50 60 70 Type of pet Number of U.S. Households That Own a Pet Dog Cat Fish Bird Reptile Horse (Source: Expedia) (Source: American Pet Products Association) Graphing Data Sets In Exercises 17–32, organize the data using the indicated type of graph. Describe any patterns. 17. Exam Scores Use a stem-and-leaf plot to display the data, which represent the scores of a biology class on a midterm exam. 75 85 90 80 87 67 82 88 95 91 73 80 83 92 94 68 75 91 79 95 87 76 91 85 18. Nursing Use a stem-and-leaf plot to display the data, which represent the number of hours 24 nurses work per week. 40 40 35 48 38 40 36 50 32 36 40 35 30 24 40 36 40 36 40 39 33 40 32 38 19. Ice Thickness Use a stem-and-leaf plot to display the data, which represent the thicknesses (in centimeters) of ice measured at 20 different locations on a frozen lake. 5.8 6.4 6.9 7.2 5.1 4.9 4.3 5.8 7.0 6.8 8.1 7.5 7.2 6.9 5.8 7.2 8.0 7.0 6.9 5.9 20. Tomato Prices Use a stem-and-leaf plot to display the data shown in the table at the left, which represent the monthly average prices (in dollars per pound) charged by 30 retail outlets for fresh tomatoes. (Source: U.S. Bureau of Economic Analysis) Tomato prices (in dollars per pound) 1.71 1.60 1.83 1.64 2.07 2.08 1.54 1.78 1.82 1.91 1.57 1.64 1.74 1.87 1.61 2.13 1.63 1.79 2.07 1.68 1.97 1.61 1.93 1.98 1.66 2.11 1.77 1.89 1.86 1.78 TABLE FOR EXERCISE 20
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