Hello,
I know the definitions of R-Sq and RMSE, but I'm having a hard time visualizing the following four cases for a univariate regression. Could anyone help?

Case 1: R-Sq high, RMSE low
Case 2: R-Sq high, RMSE high
Case 3: R-Sq low, RMSE low
Case 4: R-Sq low, RMSE high

Thanks!