Measure of Spread (Leaving Cert Mathematics): Flashcards

Variability/dispersion in data

$\text{Max value} - \text{Min value}$

Outliers

Middle 50%

$Q_3 - Q_1$

Lower quartile (25th percentile)

Upper quartile (75th percentile)

Average distance from mean

$\sigma$

$s$

$< Q_1 - 1.5 \times IQR$ or $> Q_3 + 1.5 \times IQR$

$|z| > 3$