we know that The residual value is the observed value minus the predicted value. RESIDUAL VALUE=[OBSERVED VALUE-PREDICTED VALUE] where Predicted value.--> the predicted value given the current regression equation Observed value. --> The observed value for the dependent variable.
in this problem predicted value for x=4 y (hat)=1.3+0.73*4-----> 4.22 predicted value is 4.22
observed value is 7 so RESIDUAL VALUE=[7-4.22]------> 2.78
