Correlation & Regression (Edexcel A-Level Mathematics): Flashcards

Measure of how close points lie to a straight line

Product Moment Correlation Coefficient

Perfect linear positive correlation

Perfect negative correlation

No correlation

$0 < r < 0.5$

$-0.5 < r < 0$

$r$ close to $1$

$r$ close to $-1$

Causation

Mean point (ar{x}, ar{y})

Making predictions beyond the data set

Unreliable