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Chapter 2

Chapter 2. Organizing Data. 2.1 Bar, Circle and Time-Series Graphs. We will first look at bar graphs : Vertical or Horizontal Uniform Width and Uniformly Spaced

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Chapter 2

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  1. Chapter 2 Organizing Data

  2. 2.1Bar, Circle and Time-Series Graphs • We will first look at bar graphs: • Vertical or Horizontal • Uniform Width and Uniformly Spaced • Lengths of the bars represent values of the variable being displayed, the frequency or occurrence, or percentage of occurrence. Same scale used for all. • Well annotated (labeled) with title, scales, etc. • See Figure 2-2 on p. 42

  3. 45,000 40,000 35,000 30,000 25,000 20,000 15,000 10,000 5,000 0 Pareto Chart A bar graph in which the bar height represents frequency of an event. The bars are arranged, in descending order, according to frequencies. Accidental Deaths by Type Frequency Fire Falls Poison Firearms Drowning Motor Vehicle Ingestion of food or object

  4. Circle Graphs • Also known as pie graphs. • Graphically represents proportional parts of the total population that share a common characteristic.

  5. Accidental Deaths By Type Firearms (1400, 1.9%) Ingestion of food or object (2900, 3.9%) Fire (4200, 5.6%) Motor vehicle (43,500, 57.8%) Drowning (4600, 6.1%) Poison (6400, 8.5%) Falls (12,200, 16.2%)

  6. Time-Series Graph • Data are plotted in order of occurrence at regular intervals over a period of time. • Consist of measurements of the same variable for the same subject taken at regular intervals over a period of time. • Used in economics, finance, medicine, and any situation where we want to study or monitor a similar measure over a period of time. • See figure 2-6 on p. 47

  7. How to decide which type to use • There is a green box on p. 47. Let’s refer to that.

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