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Unformatted text preview: Chapter 2: Organizing and Graphing Data Bin Wang [email protected] Department of Mathematics and Statistics University of South Alabama Mann E6 1/32 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 E6 2/32 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 E6 3/32 2.2 Organizing and Graphing Qualitative (Categorical) Data Example Table 2.4 (p. 29) Frequency Distribution of Stress on Job Mann E6 4/32 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 E6 5/32 Example (Stress Example Cont.) Mann E6 6/32 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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This note was uploaded on 02/05/2012 for the course ST 210 taught by Professor Wangs during the Fall '09 term at S. Alabama.
- Fall '09