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a correlation on a graph is when the line of best fit is positive, negative or none.
The line of best fit is simply the line that shows the general direction of the graph. The trick is to make the line go through as many points on the graph as possible. Some scatter plots have no line of best fit.
The best fit line is basically the average of a graph; it represents where, when, etc. the majority of the event occurred.
r = 0
By finding a correlation trend by means of line of best fit.