Multiple Regression Analysis, understanding multiple linear regression from 2-D & 3-D graphical analysis, testing the multiple linear model (multiple X-independent variables predicting Y-dependent variable), (1) correlation matrix testing multi-collinearity, (2) Durbin Watson testing for serial correlation, (3) testing for constant variance, (4) R-Squared F-Test, (5) coefficients T-Test, detailed discussion by Allen Mursau