Least Squares Regression Line:
Coefficient of Correlation (r):
Slope (b) = (nΣxy - ΣxΣy) / (nΣx² - (Σx)²)
Y-intercept (a) = (Σy - bΣx) / n
Correlation coefficient (r) = (nΣxy - ΣxΣy) / √[(nΣx² - (Σx)²)(nΣy² - (Σy)²)]