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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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Presentation Transcript
a picture is worth a thousand words
A Picture is worth a thousand words
  • First three rules for describing data:
    • Make a picture
    • Make a picture
    • Make a picture
categorical data
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.
creating a bar graph
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
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.
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.

further resources
Further Resources
  • Practice of Statistics: pg 8-9
  • Homework 1.1: #2