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Displaying Distributions With Graphs. Section 1.1. A Picture is worth a thousand words. First three rules for describing data: Make a picture Make a picture Make a picture. Categorical Data.

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A picture is worth a thousand words l.jpg
A Picture is worth a thousand words

  • First three rules for describing data:

    • Make a picture

    • Make a picture

    • Make a picture


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Categorical Data

  • The following table displays the sales figures and market share (percent of total sales) achieved by several major soft drink companies in 1999. That year a total of 9930 million cases of soft drink were sold.


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Creating a Bar Graph

  • Title your graph

  • Label axes

    • Horizontal Axis is the categories

    • Vertical Axis can be

      • Counts (Frequency)

      • Proportions (Relative Frequency)

      • Percents

  • Scale your axes

  • Draw vertical bars to represent counts, proportions, or percents


Creating a pie graph l.jpg
Creating a Pie Graph

  • The most accurate way to create a pie graph is to use a computer. However pie graphs can be created using estimation, or by using a protractor and using the appropriate number of degrees to create the graph.


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Bar Graphs show a bar that represents either the count, proportion, or percentage of each category. Bar graphs may or may not show all categories.

Pie Graphs show how a “whole” divides into categories using either the proportion or percentage. To use a pie graph you must include all the categories that make up the whole.


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Further Resources proportion, or percentage of each category. Bar graphs may or may not show all categories.

  • Practice of Statistics: pg 8-9

  • Homework 1.1: #2


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