AT 2: VISUALIZING DATA 1. The following table indicates the percentage of residential electricity consumption in the United States, organized by type of appliance in a recent year: Type of Appliance Percentage (%) Air conditioning 18 Clothes dryers Clothes washers/other Computers Cooking Dishwashers Freezers GOOVOGNNN - 2 Lighting Refrigeration Space heating Water heating TVs and set top boxes Source: Data extracted from J. Mouawad, and K. Galbraith, "Plugged-in Age Feeds a Hunger for Electricity," The New York Times, September 20, 2009, pp. 1, 28. a. Construct a bar chart, a pie chart, and a Pareto chart. b. Which graphical method do you think is best for portraying these data? c. What conclusions can you reach concerning residential electricity consumption in the United States? 2. The following table uses the data in Solar Power to show the yearly amount of solar power installed (in megawatts) in the United States from 2000 through 2008: Amount of Solar Year Power Installed 2000 18 2001 2002 44 2003 68 2004 83 2005 100 2006 140 2007 210 2008 250 Source: Data extracted from P. Davidson, "Glut of Rooftop Solar Systems Sinks Price," USA Today, January 13, 2009, p. 1B. a. Construct a time-series plot for the yearly amount of solar power installed (in megawatts) in the United States. b. What pattern, if any, is present in the data? 3. A manufacturer of insulation randomly selects 20 winter days and records the daily high temperature 24, 35, 17, 21, 24, 37, 26, 46, 58, 30, 32, 13, 12, 38, 41, 43, 44, 27, 53, 27 a. Construct a stem-and-leaf display Is there a