Chapter 2 - Chapter 2 KVANLI PAVUR KEELING Click to edit...

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Click to edit Master subtitle style 3/10/11 Chapter 2 Data Presentation Using Descriptive Graphs KVANLI PAVUR KEELING
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3/10/11 Chapter Objectives At the completion of this chapter, you should be able to answer: How does one construct (and when is it appropriate to use) each of the following graphs: a. Histogram b. Frequency polygon c. Ogive
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3/10/11 Chapter Objectives - Continued ∙ What is a frequency distribution, and how would you construct a frequency distribution from a set of data? ∙ What are some of the ways in which a
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3/10/11 Describing a Sampl e Chapter 2: Discusses how to draw a chart or graph Chapter 3: Discusses how to crunch a number or two, such as an
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3/10/11 Salary Data in Table 2.2
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3/10/11 Frequency Distribution for Continuous Data 41.5 39.4 40.9 35.9 37.4 39.5 40.3 39.3 41.6 36.6 41.1 35.7 43.7 37.0 41.3 40.6 38.0 42.4 35.7 41.4 39.2 36.8 39.3 43.8 38.5 43.0 36.3 35.6 36.2 38.1 34.8 38.1 35.7 36.5 39.5 37.9 34.3 36.8 33.8 35.0 37.8 38.7 37.2 32.8 38.2 37.0 39.7 38.8 35.2 36.2 Original Data 32.8 33.8 34.3 34.8 35.0 35.2 35.6 35.7 35.7 35.7 35.9 36.2 36.2 36.3 36.5 36.6 36.8 36.8 37.0 37.0 37.2 37.4 37.8 37.9 38.0 38.1 38.1 38.2 38.5 38.7 38.8 39.2 39.3 39.3 39.4 39.5 39.5 39.7 40.3 40.6 40.9 41.1 41.3 41.4 41.5 41.6 42.4 43.0 43.7 43.8 Ordered Array Table 2.3
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3/10/11 Constructing a Frequency Distribution 1. Gather the sample data 2. Arrange the data in an ordered array 3. Select the number of classes to be used 4. Determine the class width 5. Determine the class limits for each class 6. Count the number of data values in each class (the class frequencies) 7. Summarize the class frequencies in a frequency distribution table
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3/10/11 Constructing the Frequency Distribution To see what’s going on within the data, we’ll put the data into classes (groups) Let K be the number of classes Generally, K is between 5 and 20 and the larger the sample, the more classes you can use Let’s try K = 6 classes
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3/10/11 Constructing the Frequency Distribution Looking at the ordered data, the smallest value is L = 32.8 and the largest value is H = 43.8 Next, find Round this to a “nice number” Here we’ll round this to 2 83 . 1 6 8 . 32 8 . 43 = - = - K L H Other Applications ( H-L)/K Round to 11.6 10 46.5 50
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Chapter 2 - Chapter 2 KVANLI PAVUR KEELING Click to edit...

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