Lecture3 Graphs

Lecture3 Graphs - Bar Graphs Rules for construction Bars...

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Unformatted text preview: Bar Graphs Rules for construction Bars for different categories dont touch (emphasizes the discontinuity) * Bars are all the same width Frequency axis starts at zero Both axes clearly labeled Conventions: Categorical Variable on the x-axis Frequency count on the y-axis 1 Bar Graphs 250 500 750 1,000 UCSD SDSU What if we wanted to plot data for each University for males and females? # of Students Who Had Nervous Breakdowns in Stats 2 Bar Graphs 250 500 750 1,000 UCSD SDSU Males Females # of Students Who Had Nervous Breakdowns in Stats by Gender * Under these circumstances its okay for some of the bars to touch 3 Histograms A specialized type of bar graph for quantitative data The bars touch The width of the bars, which should be uniform throughout the graph, indicates the class interval Process of selecting class intervals mirrors the process for Grouped F.D.s 4 F.D.s Revisited IQ 130-134 2 125-129 7 120-124 10 115-119 11 110-114 8 105-109 7 100-104 3 95-99 1 90-94 1 Total 50 % 4% 14% 20% 22% 16% 14% 6% 2% 2% 100% c...
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This note was uploaded on 01/21/2009 for the course PSYC 60 taught by Professor Ard during the Winter '08 term at UCSD.

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Lecture3 Graphs - Bar Graphs Rules for construction Bars...

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