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1|Organising data
Raw data ­ the data collected
Stem and leaf diagram ­ single data or back-to-back data
5|468 means 54,56,58 730 |2means 20,23,27
Always use a key

Discrete data ­ possible values are separated by gaps , eg 1, 1.5, 2, 2.5,...
Continuous data ­ comes from measurement, eg…

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Outliers ­ an exceptionally high or low value
Tukey's rule ­ 1.5 × IQR beyond the upper or lower quartile is defined as an outlier
x < Q1 - 1.5(IQR) or x > Q3 + 1.5(IQR)
shown as isolated crosses on box plots (with the whiskers drawn to the highest/lowest…


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