Bivariate Data (HSC SSCE Mathematics Advanced): Flashcards

Data about two related variables as ordered pairs of measurements

Measures strength & direction of linear correlation

$-1 leq r leq 1$

Perfect positive correlation; all points on upward-sloping line

Perfect negative correlation; all points on downward line

No linear correlation between variables

As $x$ increases, $y$ tends to increase ($0 < r leq 1$)

As $x$ increases, $y$ tends to decrease ($-1 leq r < 0$)

Predicting values within the range of observed data

Predicting outside data range; can be very misleading