ANSWER ONLY: #23 & #24

24. To reduce energy consumption, many governments 15. The frequency of a category is the dollar value of the around the world have considered legislation to observations in that group. phase out incandescent light bulbs. The goal is to 16. A relative frequency is the number of observations move toward compact fluorescent bulbs and other more efficient sources of lighting. Can this really belonging to a category. make much difference? The California Energy 17. Use a bar chart to show frequencies and a pie chart to Commission reported the following summary of show shares of a categorical variable that is not ordinal. household electricity use. Based on this chart, 18. The area principle says that the proportion of the can more efficient lighting have much impact on area of a graph devoted to a category must match the number of cases found in the category. household energy use? 19. Put the labels of the categories in order in a bar chart Household Uses of Electricity when showing the frequencies of an ordinal variable. 20. The bar chart of a recoded categorical variable has the same number of bars as the bar chart of the original categorical variable. 21. A Pareto chart puts the modal category first. Others Lighting 22. The median of a categorical variable is the category 30% 37% with the most items. Think About It 23. These two pie charts show the origin of cars bought Cooling Refrigeration 14% by customers who traded in domestic and Asian 8% models. For example, among those trading in a car produced by a domestic manufacturer, 29% pur- Ventilation chased a car made by an Asian manufacturer. What's 11% the message of these two pie charts? Domestic Trade-in 25. This plot shows the holdings, in billions of dollars, of U.S. Treasury bonds in five Asian countries. Is this a European bar chart in the sense of this chapter, or is it a chart 2% of a table of five numbers that uses bars? Holdings of U.S. Treasury Bonds $1200 Asian 29% $1100 $1000 Domestic $900 59% $800 $700 (billions) $600 $500 Asian Trade-in $400 European $300 4% $200 $100 $0 Domestic 18% Japan China South Taiwan Hong Korea Kong Country Asian 78% 26. The Wall Street Journal on January 19, 2016, used a chart resembling the following one to illustrate the rising amounts that Netflix spends to provide streaming content online. Is this the bar chart of a categorical variable in the sense of this chapter, or is it a timeplot that uses bars to show the data