Statistics Chapter 12 1

Statistical Graphs: A Problem-Solving Tool Section

Example The following data show the average amount of money spent on health care by persons under age 25: Graph the data using 1–5 as the years and 400–600 as the amounts of $50 intervals. 3

Graph Average Amount of Money Spent on Health Care by Persons Under 25 Amount (dollars) Year 4

Example  The double bar graph shows the production costs and gross income (in thousands) for a company. Approximate the percent of gross income that goes to production costs for each year. 5

Solution a.For 1998: b.For 1999: c.For 2000: 6

Example  A recent survey of households showed that more people planned to make major purchases this year. The following table gives the results of the survey. Use side-by-side vertical bar graphs comparing the percent of consumers planning to buy each of the items with the percent who bought each item last year. Bought Last YearPlan to Buy This Year Home Car Appliance RV's62100 None

Bought Last YearPlan to Buy This Year Home Car Appliance RV's Solution Bought Last Year Total = 2407 Plan to Buy this Year Total = 2684 Bought Last YearPlan to Buy This Year Home Car Appliance RV's = 4.2% = 13.5% = 20.2% 0.026= 2.6% 101/ / / / / / / / = 5.6% = 14.7% = 20.6% = 3.7% 8

Graph 9

Example Construct a pie chart depicting the percentage of American adults interviewed who drink caffeinated beverages on a daily basis. 1-2 cups per day cups per day cups per day cups per day 8 None 27 Total: 94 10

Solution Cups per DayPercentage 1-2 cup3434/ cups1515/ cups1010/94 7+ cups88/94 None2727/94 Cups per DayPercentage 1-2 cup340.36= 36% 3-4 cups = 16% 5-6 cups = 11% 7+ cups80.09 = 9% None = 29% 11

Graph 12 END