Interpreting Bar Charts and Pie Charts - PowerPoint PPT Presentation

Loading...

PPT – Interpreting Bar Charts and Pie Charts PowerPoint presentation | free to view - id: 4ca336-ZDc5Y



Loading


The Adobe Flash plugin is needed to view this content

Get the plugin now

View by Category
About This Presentation
Title:

Interpreting Bar Charts and Pie Charts

Description:

Interpreting Bar Charts and Pie Charts Interpreting Bar Charts and Pie Charts In this presentation Bar charts Pie Charts Interpretation Guidelines Bar Charts Bar ... – PowerPoint PPT presentation

Number of Views:254
Avg rating:3.0/5.0
Slides: 12
Provided by: Distr98
Category:

less

Write a Comment
User Comments (0)
Transcript and Presenter's Notes

Title: Interpreting Bar Charts and Pie Charts


1
Interpreting Bar Charts and Pie Charts
2
Interpreting Bar Charts and Pie Charts
  • In this presentation
  • Bar charts
  • Pie Charts
  • Interpretation Guidelines

3
Bar Charts
  • Bar Charts are used to display qualitative data
  • Bar charts may display
  • Counts (or frequencies)
  • Percentages
  • Proportions
  • This allows comparison between categories.

4
Bar Charts
  • The vertical scale is the frequency, relative
    frequency, or percentage.
  • This is critically important to recognize and
    should be labeled.
  • Frequencies are raw counts. That is, how many
    individuals prefer each of the colors.
  • Relative frequencies are really proportions
    (usually decimals). To find the relative
    frequencies, divide the frequency by the total
    (for red, 11/25 or .44).
  • Percentages are relative frequencies expressed as
    percentages (for red, 44).
  • See the example.

5
Bar Charts
  • The horizontal scale shows the different
    categories (sometimes multiple categories are
    lumped together into an other category)..
  • All bars should have the same width.
  • There are gaps between the bars (since there is
    no connection between them)
  • Categories may be listed in any order.
  • More complicated bar charts exist (such as
    stacked or side-by-side).

6
Bar Chart Example
Back to slide 4 on Bar Charts
7
Pie Charts
  • A circle is divided up proportionately to show
    what percentage of the total each category
    represents.
  • They convey information regarding only the
    relative size of categories (because of this,
    they may mislead as totals remain unknown).

8
Pie Chart Example
9
Interpretation Guidelines
  • Carefully read all labels (title, axes, bars, pie
    segments, etc.) including the units and scale (be
    sure to note the scales starting point).
  • Identify (if possible) the source of the data. Is
    there sufficient reason to suspect the source may
    be attempting to persuade? In what way?

10
Interpretation Guidelines
  • Consider and watch for extreme values or other
    possible anomalies.
  • Do the bars or pie sections represent counts or
    relative counts?
  • If there are multiple displays, are their scales
    and axes consistent?

11
Interpreting Bar Charts and Pie Charts
  • This concludes the presentation
About PowerShow.com