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10 cards from this deck
rrr
r∈[−1,1]r \in [-1,1]r∈[−1,1]
r=+1r = +1r=+1
r=−1r = -1r=−1
The other variable also increases
The other variable decreases
0.75≤∣r∣<0.90.75 \leq |r| < 0.90.75≤∣r∣<0.9
0.5≤∣r∣<0.750.5 \leq |r| < 0.750.5≤∣r∣<0.75
No, correlation does NOT imply causation
r=b×σxσyr = b \times \frac{\sigma_x}{\sigma_y}r=b×σyσx
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