Question   We see the direction and the spread of the scatterplot in order to decide the correlation.

If the points are really close to each other then the magnitude of the correlation is high. If the points are scattered then the magnitude of the correlation is low. Then we see the direction, whether Y increases with X (+ve correlation) or decreased(-ve correlation)

Let me know in the comments if anything is not clear. I will reply ASAP! Please do upvote if satisfied!

Graph - 1 :  b. - 0.94 (highly negatively correlated)

Graph - 2 : d. 0.87 (quite positively correlated)

Graph - 3 : a. 0.10 ( thinly positively correlated)

Graph - 4 : c. - 0.53 (medium negatively correlated)

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