<p>Unfortunately I am enrolled in an online Statistics course which can barely explain how to calculate the mean appropriately. Thus, I like to consider myself as 'self-studying' for the AP. I opened up my Barrons book and began my studying from the beginning, so please sympathize with the naivety of the question.</p>
<p>The Least Square Regression Line can be calculated through the formula, y^ = b0 = b1x where b0 is the y-intercept and b1 is the slope. Barrons lists two ways of calculating the slope of b1. First it says that the slope is R, which makes sense in my head. Then it says that the slope is [(R)*(Sy/Sx)] where Sy and Sx are the standard deviations of the two sets. That way does not make too much sense in my head . Unless Sy/Sx always equals 1, I don't get which way to solve for the slope. </p>
<p>Thanks!</p>