7 - September 20 Shape of Distributions

7 - September 20 Shape of Distributions - CAUTION! BE AWARE...

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Unformatted text preview: CAUTION! BE AWARE of Unintentional Consequences Frequency Distribution Frequency Distribution • A frequency distribution is a grouping of data into categories showing the number of observations in each mutually exclusive category. Frequency Distribution Frequency Distribution 0 – 9,999 10,000 – 19,999 20,000 – 29,999 30,000 – 39,999 40,000 – 49,999 50,000 – |||| ||||||||| ||||||||| |||||||||| ||||| || | 4 9 9 10 5 2 1 Family Income Tally Frequency Class Characteristics Class Characteristics • Lower class limits are the smallest numbers that can actually belong to the different classes. • Upper class limits are the largest numbers that can actually belong to the different classes. • Class boundaries are the numbers that are the upper and lower class limits if there are no gaps between the consecutive classes. Class Characteristics Class Characteristics • Class marks are the midpoints of the classes. • Class width is the difference between two consecutive lower class limits. Frequency Distribution Frequency Distribution • This table has 5 classes. • Lower class limits: • 1, 6, 11, 16, 21 • Upper class limits: • 5, 10, 15, 20, 25 • Class boundaries: • .5, 5.5, 10.5, 15.5, 20.5, 25.5 • Class Marks: • 3, 8, 13, 18, 23 • Class width: 5 Score Frequency 1 - 5 6 - 10 11 - 15 16 - 20 21 - 25 Frequency Distribution Frequency Distribution • This table has 5 classes ] • Lower class limits: • 1, 6, 11, 16, 21 • Upper class limits: • 5, 10, 15, 20, 25 • Class boundaries: • .5, 5.5, 10.5, 15.5, 20.5, 25.5 • Class Marks: • 3, 8, 13, 18, 23 • Class width: 5 Score Frequency 1 - 5 6 - 10 11 - 15 16 - 20 21 - 25 Frequency Distribution Frequency Distribution • This table has 5 classes. • Lower class limits: • 1, 6, 11, 16, 21 • Upper class limits: • 5, 10, 15, 20, 25 • Class boundaries: • .5, 5.5, 10.5, 15.5, 20.5, 25.5 • Class Marks: • 3, 8, 13, 18, 23 • Class width: 5 Score Frequency 1- 5 6- 10 11- 15 16- 20 21- 25 Frequency Distribution Frequency Distribution • This table has 5 classes. • Lower class limits: • 1, 6, 11, 16, 21 • Upper class limits: • 5, 10, 15, 20, 25 • Class boundaries: • .5, 5.5, 10.5, 15.5, 20.5, 25.5 • Class Marks: • 3, 8, 13, 18, 23 • Class width: 5 Score Frequency 1 - 5 6 - 10 11 - 15 16 - 20 21 - 25 Frequency Distribution Frequency Distribution • This table has 5 classes....
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This note was uploaded on 03/01/2008 for the course MIS 311F taught by Professor Cleveland during the Fall '07 term at University of Texas at Austin.

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7 - September 20 Shape of Distributions - CAUTION! BE AWARE...

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