The range by dsu13762

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									            The range.



           A Learning Object produced by
        Sidney Tyrrell, Coventry University,
as part of her National Teaching Fellowship project.
              The range
is the difference between the largest and
 smallest values.
For the data set 4 4 4 the range is 0
For the data set 0 4 8 the range is

                 8-0=8
              The range
is the difference between the largest and
smallest values.


For the data set -92 4 100 the range is

       100-(-92) = 100 + 92 = 192
      The range: a warning
• It is easy to calculate, but
• because it is found from the extreme
  values it may not be helpful,
• and may give quite the wrong idea
  about the data.
         The wrong idea?
• Most people taking A levels are aged
  16 to18.
• The range of ages is at least 60
  years; the the youngest being 9.
• How helpful is the range in giving you
  a general idea of the spread of this
  data?
          Finally a reminder
• Why measure spread?
• Finding the spread helps us
  understand our data better;
• which should lead to better decisions
  and analysis.

								
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