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Yes it can be a correlation coefficient.
No, it cannot be a correlation coefficient.
Evidence that there is no correlation.
This means there is no correlation between the points on a graph. There is no linear relationship between the x and the y values at all. 0.98 is usually deemed to be an acceptable r2 value
A coefficient of zero means there is no correlation between two variables. A coefficient of -1 indicates strong negative correlation, while +1 suggests strong positive correlation.