help help help hel help please, statistics?

Question

1. suppose all the points of a data set lie on the line of best fit which has equation y = 3.45x - 7.21. What is the correlation coefficient? (why is it 1? what if the data set does not lie on the line of best fit?)

please explain. thank u

Answer 1

This derivation of the correlation coefficient with examples is excellent:
http://mathworld.wolfram.com/CorrelationCoefficient.html