Statistical Measures (AQA A-Level Mathematics): Flashcards

A value indicating position of features in a data set (e.g., mean, median, mode)

Sum of

$\bar{x} = \frac{\sum x}{n}$

Measures centre; uses all data

$\frac{n+1}{2}$

Measures centre; uses only a single data point

When data has no extreme outliers

When data has extreme outliers

Median of the lower list

$\text{IQR} = UQ - LQ$