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10 cards from this deck
Data about two related variables as ordered pairs of measurements
Measures strength & direction of linear correlation
−1leqrleq1-1 leq r leq 1−1leqrleq1
Perfect positive correlation; all points on upward-sloping line
Perfect negative correlation; all points on downward line
No linear correlation between variables
As xxx increases, yyy tends to increase (0<rleq10 < r leq 10<rleq1)
As xxx increases, yyy tends to decrease (−1leqr<0-1 leq r < 0−1leqr<0)
Predicting values within the range of observed data
Predicting outside data range; can be very misleading
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