GRAPHS

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GRAPHS
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Types of Graphs

• Bar Graphs
• Line Graphs
• Pie Graphs
• Histogram

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Bar Graph

• Def - a chart with rectangular bars with lengths
  proportional to the values that they represent.
  Used for comparing two or more values.

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Line Graph

• Def - A graph that uses points connected by lines
  to show how something changes in value (as time
  goes by, or as something else happens).

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Pie Graph

• Def - a circular chart divided into sectors,
  illustrating relative magnitudes or frequencies.
  It shows parts of a whole.

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Histogram

• Def - Histograms resemble bar charts closely. One
  main difference is that histograms will normally
  be shown with the bars touching each other, with
  no spacing in between, to account for the
  continuous nature of the data, whereas simple bar
  charts tend to have spaces to separate the bars.

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Which Graph?

• Given the following sets of data, decide
• which of the four types of graphs would
• be most appropriate to display the data.

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• 32 of Americans, 12 of Lithuanians, 21 of
  Germans, 27 of Spaniards, and 8 of others have
  gained more than 30 pounds in the past four
  years.
• What would be the best graph to represent this
  information?

Answer A Pie Graph!
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• We want to compare the total revenues of five
  different companies.
• What would be the best graph to represent this
  information?

Answer Bar Graph!
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• We want to compare populations of pandas over the
  past seven years.
• What would be the best graph to represent this
  information?

Answer Line Graph!