Outliers & Cleaning Data (AQA A-Level Mathematics): Flashcards

Data points significantly different from rest of data

Outside $1.5 \times \text{IQR}$ from $Q1$ or $Q3$

$Z$-score $> 3$ or $< -3$

$\text{IQR} = Q3 - Q1$

$Q1 - 1.5 \times \text{IQR}$

$Q3 + 1.5 \times \text{IQR}$

Median is less sensitive to outliers

Mean, median, or mode of remaining data

Adjust data to mean of $0$ and SD of $1$

Between $0$ and $1$