Displaying Distributions Qualitative Variables Lecture 14 Sections 4 3 1 4 3 2 Tue Feb 5 2008 Pie Charts Pie chart Use the percentage associated with the category to compute the central angle of the pie slice E g 25 of 360 90 A pie chart facilitates the comparison of one category to the whole Racial Profiling by the Police Who gets pulled over Draw a pie chart of the data Who Gets Pulled Over How does the distribution by race of those pulled over compare to the distribution in the general population Population Pulled Over White 73 65 Black 20 24 Hispanic 6 7 Who Gets Pulled Over The sample consisted of 520 079 cases If we compute the p value we get p value 10 99 Is that significant Who Gets Pulled Over An interesting question raised by the superintendent of the Virginia State Police Do we know at any given hour what the demographics of I 95 in Richmond may be What kind of bias other than racial profiling may be in play here Racial Profiling by Sharks Who gets bitten Bar Graphs Bar graph A bar graph facilitates the comparison of one category to another Bar Graphs Who get pulled over Draw a bar graph of the data Pie Chart Examples Where Your Income Tax Money Really Go es Major Religions of the World Ranked by Number of Adherents Warning against using piecharts
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