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Unformatted text preview: Chapter 2: Organizing and Graphing Data Bin Wang bwang@jaguar1.usouthal.edu Department of Mathematics and Statistics University of South Alabama Mann E7 1/33 2.1 Raw data Definition (Raw Data (source data, ungrouped data)) Data recorded in the sequence in which they are collected and before they are processed or ranked are called raw data . Mann E7 2/33 2.2 Organizing and Graphing Qualitative (Categorical) Data Definition A frequency distribution for categorical data lists all categories and the number of elements that belong to each of the categories. Example Table 2.3 (p. 28) Type of employment students intend to engage In Mann E7 3/33 2.2 Organizing and Graphing Qualitative (Categorical) Data Example Table 2.4 (p. 29) Frequency Distribution of Stress on Job Mann E7 4/33 Notes Notes Notes Notes 2.2.2 Relative Frequency and Percentage Distributions Definition The relative frequency for a particular category is the fraction or proportion of the time that the category appears in the data set. It is calculated as relative frequency = frequency of the category sum of all frequencies . When the table includes relative frequencies, it is sometimes referred to as a relative frequency distribution. Definition (Percentage) percentage = ( relative frequency ) * 100 . Mann E7 5/33 Example (Stress Example Cont.) Mann E7 6/33 Example The data in the column labeled vision is the answer to the question, What is your principle means of correcting your vision?...
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 Fall '09
 Wangs

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