Box and Whisker Plots

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Box and Whisker Plots

• Created by
• Leslie Lause
• Owensville Middle School
• 7th grade Mathematics

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Objectives

• Objective
• MA,DP,1,C,07
• The students will select, create and use
  appropriate graphical representations of data
  using box plots.
• MA,DP,2, A, 07
• The students will find, use, and interpret
  measures of center including interquartile ranges.

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Box and Whisker plots are used to display and
summarize data.
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When plotting on a Box and Whisker plot

• FIRST
• Find median of given data
• Find the median of the upper half which is the
  upper quartile (UQ).
• Find the median of the lower half which is the
  lower quartile (LQ).

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Second

• Graph the median on the number line.
• Graph the quartiles on the number line.
• Graph the lower and upper extreme.(biggest and
  smallest value.)

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Third

• Draw a box around the quartiles
• Draw a vertical line at the median.

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Fourth

• Draw a line from the quartiles to the extremes

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Interquartile range

• Found by subtracting the upper quartile and the
  lower quartile.

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Outliers

• Data that is more than 1.5 times the
  interquartile range from the quartiles..
• Example Upper Quartile 89
• Lower Quartile 75
• Inter quartile range is 14
• 141.521
• UQ21 8921 110
• LQ-21 75-2154
• Outliers will be below 54 and above 110

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Your Assignment

• Glencoe Mathematics, Applications and Concepts
• Page 117 6-12even