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SQA Attainment and School Leaver Qualifications in Scotland: 2006/07



Boxplots have been used to provide a visual summary of the range of scores attained by a group of pupils, after the tariff scores are ordered from highest to lowest. The five main points shown by a boxplot can be seen below:

box plot diagram

It can be seen that the box contains the middle half of the scores attained by pupils. The larger the box, the greater the spread in scores attained by the middle group of pupils. The Middle value of all scores attained is shown by the line across the box. The lines from the box show the minimum and maximum values attained by pupils.