Bluman A.G. Elementary Statistics- A Step By Step Approach

Section 2–3 Other Types of Graphs 69Figure 2–9yHow People Get to WorkyHow People Get to WorkOther Types of GraphsUsed in StatisticsAuto3025BusTrolleyFrequency2015Train10Walk(a) Bar graph0 5 10 15 20 25 30Peoplex50(b) Pareto chartAuto Bus Trolley Train WalkxyTemperature over a 9-Hour PeriodMarital Status of Employeesat Brown’s Department Store60°Temperature (°F)55°50°45°40°Widowed5%Divorced27%Married50%Single18%012 1 2 3 4 5 6 7 8 9Time(c) Time series graphx(d) Pie graphObjective 3Represent data usingbar graphs, Paretocharts, time seriesgraphs, andpie graphs.Bar GraphsWhen the data are qualitative or categorical, bar graphs can be used to represent the data.A bar graph can be drawn using either horizontal or vertical bars.A bar graph represents the data by using vertical or horizontal bars whose heights orlengths represent the frequencies of the data.Example 2–8College Spending for First-Year StudentsThe table shows the average money spent by first-year college students. Draw ahorizontal and vertical bar graph for the data.Electronics $728Dorm decor 344Clothing 141Shoes 72Source: The National Retail Federation.2–35