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Chapter 3 Displaying and Describing Categorical Data

Chapter 3 Displaying and Describing Categorical Data. AP Statistics. Categorical vs Quantitative Data. Categorical data: Names categories and answers questions about how cases fall into those categories. Can be a number, example: grade in school (12 th ) Quantitative data:

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Chapter 3 Displaying and Describing Categorical Data

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  1. Chapter 3Displaying and Describing Categorical Data AP Statistics

  2. Categorical vs Quantitative Data Categorical data: Names categories and answers questions about how cases fall into those categories. Can be a number, example: grade in school (12th) Quantitative data: Answers questions about the quantity of what is measured. Takes numerical values for which things like averages make sense.

  3. Displaying Categorical Data • Tables (frequency tables) • Bar chart • Pie chart • Segmented Bar Graph • Good for comparing, looking for independence. • Only use for percents—not counts

  4. Displaying Categorical Data Area Principle Basically—don’t make graphs 3-D. May look nice, but is not accurate.

  5. Describing Categorical Data

  6. Describing Categorical Data Create a segmented bar graph comparing education level among smokers and non-smokers.

  7. Describing Categorical Data Do you think smoking is independent of education level?

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