Estimation of Correlation Coefficient (Leaving Cert Mathematics): Flashcards

$r$

$-1$ to $+1$

Perfect positive linear relationship

Perfect negative linear relationship

No linear relationship

Upward-sloping line of points

Downward-sloping line of points

Points closely clustered around a straight line

Points are more scattered

$r \approx \pm 0.9$ or higher

$r \approx \pm 0.5$

$r \approx \pm 0.2$ or lower

No

Can significantly affect the correlation coefficient