Analysing Data (Junior Cert Mathematics): Flashcards

Show how spread out or varied the data is

Difference between largest and smallest values

Highest value minus lowest value

Easy and quick to calculate

Sensitive to outliers

Spread of the middle half of data

Middle 50%

Median of the lower half of data

Median of the upper half of data

$Q3 - Q1$

Not affected by extreme values

IQR ignores extremes; range uses extremes