Graphs

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• Graphs
• TOPEC-Mrs. Fought

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Graphs Data Tables

• When to use
• Bar Graphs
• Line Graphs
• Scatter Plot
• Pie Charts

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Bar Graphs

• Use when comparing data quickly
• Does Jupiter have more moons than Pluto?
• Use to identify trends
• time spent sleeping per day of the week

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Line Graphs

• Use when controlling one variable and seeing how
  it compares to another variable.
• example an experiment where you measure the
  growth of a plant over time.

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Experimental Data for Plant Growth versus Time
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Scatter Plot Graphs

• Use like a line graph, but the points are not
  connected.
• Shows trends in data, or correlation, either
  positive, negative, or no correlation.

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Pie Charts

• Used to show part of the whole, or what
  percentage is represented.
• Example What is the favorite kind of movie in
  Mrs. Foughts class?

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Favorite kind of movie in Mrs. Foughts class
                                                  
   
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Labeling Graphs

• Use standard fonts and consistent labels and
  terms.
• The key elements of labeling include terms,
  labels, title font.
• Be sure to include units on x and y axis.
• Include data table
• Always have a title on your graph. Usually the
  title will be The Dependence of ____ on _____

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A Good Graph
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• In this graph, there are a number of flaws
• The ratio of the heights of bars within each
  category does not reflect the actual ratio. For
  example, compare the ratio of the heights of bar
  in the housing category with those in food or
  transportation.
• There is an implied precision that is
  unrealistic. Do you think that the average can be
  estimated to the nearest penny!
• The percentages are computed incorrectly. A
  doubling of costs is only a 100 increase.
• Too many ducks'.

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Dont Get Too Fancy!

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Too Much Clutter!
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Watch out for misleading graphs and charts!

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Missing Zero, Same Data
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Missing Years, Same Data
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Not a Misleading Graph
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Misleading Graph
Data is the same. But the Scale has changed.
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Rules for Graphs

• 1. Have a proper title
• 2. Have correct units and labels on X and Y axis
• 3. X and Y axis are to scale
• 4. Use a ruler
• 5. Have a key
• Plot points correctly

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Remember to Keep It Neat and
Simple!