How do you find the correlation of a scatter plot?
Just like any other graphical presentation, scatter plot can only give estimate, not real value. To find the value of correlation, you have to calculate.
Basically, if the plot indicates a clear pattern of upward or downward trend as you go from left to right (low x to high x), there is significant correlation between the independent variables. Upward shows positive correlation, downward means negative.
Otherwise if there does not seem to be any pattern, it is safe to say that x and y are not correlated.