Chapter 3 - Chapter 3 Displaying Categorical Data...

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Chapter 3 – Displaying Categorical Data ActivStats: 3-1 to 3-3 Read: Chapter 3 Example: For each of 2201 people on the Titanic the following variables were recorded: Ticket Class (First, Second, Third, Crew), Survival (Dead or Alive), Age (Adult or Child) and Sex (Male or Female). ONE VARIABLE Who = people on Titanic What = Ticket Class Distribution Frequency Table = list of categories and counts or percentage of observations of each category. Class Count (frequency) % (relative frequency) First 325 14.766 Second 285 12.949 Third 706 32.076 Crew 885 40.209 Total 2201 100 Distribution of a variable is the list of possible values of the variable and corresponding relative frequencies. Graphical displaying of a distribution of categorical data: 1. Bar chart 2. Pie chart The Area of a bar or a slice should correspond to the frequency of a category.
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Bar chart: Pie Chart: 0 100 200 300 400 500 600 700 800 900 1000 First Second Third Crew Crew 40% Third 32% Second 13% First 15% Example: For each of 2201 people on the
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This note was uploaded on 07/25/2008 for the course STT 200 taught by Professor Dikong during the Summer '08 term at Michigan State University.

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Chapter 3 - Chapter 3 Displaying Categorical Data...

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