2_Tables_and_Graphs_Outline

2_Tables_and_Graphs_Outline - 1 2 3 4 5 6 7 Descriptive...

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Descriptive Statistics Tables & Graphs Tables You should be able to . . . • Define frequency distribution • Construct –an ungrouped frequency distribution –a grouped frequency distribution –a relative frequency distribution • Define and identify outliers Frequency Distribution • Sorted collection of observations showing the number of times (or frequency) each observation occurs • Two kinds: ungrouped grouped Example • We are interested in the size of science classes in private elementary schools. • We surveyed 25 private schools and determined the number of students in each fifth grade science class. The data for 25 schools are: 5 15 18 13 14 30 29 20 20 5 14 15 15 17 25 25 20 19 20 20 15 18 20 25 15 Ungrouped Frequency Distribution • If you have a large number of values that cover a wide range, the ungrouped frequency distribution is not appropriate. –For example, 1000 observations that range from 0 to 500 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

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2_Tables_and_Graphs_Outline - 1 2 3 4 5 6 7 Descriptive...

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