Weekly Powerpoints

Weekly Powerpoints - Displaying Data Graphs Frequency...

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9/2/2010 1 Displaying Data: Graphs & Frequency Distributions 1 Grouped Frequency Distributions • When there are many different possible scores (or values) for a variable, displaying every score can be cumbersome • It is better to form a grouped frequency distribution, where frequencies for individual values of the variable are collapsed into a small number of intervals to display trends in the data 2 Example: USC Exercise Data • A survey asks students’ monthly exercise habits, with an open range for answers: 3 7 20 12 20 7 1 1 18 5 14 15 15 5 15 11 9 9 10 3 8 9 7 1 6 14 10 6 9 9 8 2 4 13 10 12 8 10 17 13 4 12 6 1 5 9 11 18 11 7 6 Lowest Score Highest Score (n=50)
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9/2/2010 2 Choosing the # of Intervals • The # of intervals you choose for a table is often determined by trial and error (or automatically configured with statistical software), but there are general guidelines – With too few intervals information is lost – With too many intervals the table becomes cumbersome and loses clarity
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This note was uploaded on 02/17/2011 for the course PYSC 227 taught by Professor Fairchild during the Spring '10 term at South Carolina.

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Weekly Powerpoints - Displaying Data Graphs Frequency...

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