Chap2-3-GraphingTechniques

Chap2-3-GraphingTechniques - 1 CHAPTER 2/3 GRAPHING...

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Unformatted text preview: 1 CHAPTER 2/3: GRAPHING TECHNIQUES Stats & Prob. for Bus. Mgmt (Stat1100) Jochem Graphing Techniques b Overview b 1. Overview of Graphing Techniques b 2. Graphing Techniques s 2.1 Relative/Cumulative Freq. Table/Diagram 2 s 2.2 Histograms s 2.3 Line, Bar and Pie Charts s 2.4 Scatter Plots & Side-by-Side Box Plots s 2.5 Contingency tables & Bar chats b 3. “Graphical Excellence” (p80) Graphing 1 Variable Graphing 2 Variables Graphing Techniques b Goals of this chapter: b 1. You know which graphing techniques work with which types of data. b 2. You can create the charts and tables shown in 3 this chapter yourself with Excel. b 3. You know the characteristics of graphical excellence. Graphing Techniques b 1. Overview of Graphing Techniques b The type of graphs/charts that is suited for displaying data depends on the number of variables and the type of data with which we deal: 4 Interval Data Nominal Data One Variable • Frequency Tables • Histograms • Frequency Tables/Charts • Bar and Pie charts (Relationship b/w) Two Variables • Scatter plot • Side-by-Side Box plots • Contingency Tables • Bar charts Graphing Techniques b 2.1 Frequency Tables b A frequency table (or, frequency distribution) shows the number of observations that fall into different classes (or, bins). 5 s Example: the number of coffees sold at 50 baseball games in December. (Data in Xr04-84.xls on your textbook CD.) b 2.1 Frequency Tables b Procedure: s Step 1: Decide on class/bin sizes. s Step 2: Count & note down the number of observations 6 Graphing Techniques that fall into each of the classes. s Step 3: Make a nice table from it. If the data set is too large to do it by hand, then use the “Histogram” function from Excel’s Data Analysis (forthcoming on next slides). b 2.1 Frequency Tables b There is also a cumulative frequency table, in which the frequency accumulates as we go into higher classes. 7 Graphing Techniques b ` For cumulative frequency charts we typically use line charts instead of bar charts. b 2.1 Frequency Tables b Besides absolute frequency tables (cumulative or not), we often see relative frequency tables (cumulative or not) that show percentages ....
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Chap2-3-GraphingTechniques - 1 CHAPTER 2/3 GRAPHING...

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