Suppose a sample regression equation is given by Yhat - 15 -0.6 X. Suppose when X is 5, Y is observed to be 8. What is the residual the model prediction, and does the model under or overpredict the value of Y? residual = -4, the model underpredicts Y residual = 4, the model underpredicts Y residual --4, the model overpredicts Y residual - 4 the model overpredicts Y