graphs-notes

graphs-notes - Last Lecture Frequency distributions...

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Unformatted text preview: Last Lecture Frequency distributions Grouping data Relative frequency Cumulative frequency Percentiles Today Visual presentation of data (graphs) Shapes of distributions Examples and review Psy 320 Graphical Representations, 1 Graphical Presentations Pie and bar charts The histogram The frequency polygon The stem-and-leaf plot Psy 320 Graphical Representations, 2 Qualitative data (Nominal variables) Political affiliation of 221 OSU Students: Relative Political Frequency Frequency Affiliation f ( X i ) p ( X i ) Democrat 92 .42 Independent 33 .15 Republican 85 .38 Other 11 .05 Psy 320 Graphical Representations, 3 Pie Chart Democrat Independent Republican Other Psy 320 Graphical Representations, 4 Bad Pie Chart Psy 320 Graphical Representations, 5 Bar Chart Dem Ind Rep O 10 20 30 40 50 60 70 80 90 100 Psy 320 Graphical Representations, 6 Bad Bar Chart Psy 320 Graphical Representations, 7 Bad Bar Chart Psy 320 Graphical Representations, 8 Bad Bar Chart Psy 320 Graphical Representations, 9 Quantitative data Cumulative Cumulative Relative Relative Frequency Frequency Frequency Frequency X i f ( X i ) F ( X i ) p ( X i ) P ( X i ) 1 1 1 .09 .09 2 1 2 .09 .18 3 2 4 .18 .36 4 3 7 .27 .64 5 2 9 .18 .82 6 1 10 .09 .91 7 1 11 .09 1.00 Psy 320 Graphical Representations, 10 The Histogram...
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graphs-notes - Last Lecture Frequency distributions...

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