When a residual plot of the standardized residuals versus a particular explanatory variable reveals a curvilinear pattern what is the

(a) problem being suggested by the residual plot?

(b) variable or might be added to the model to cure the problem suggested by the residual plot?

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(a) 3 2 T Standardized residual 1 2 3 O 0.91 4 Standardized residual 0.92 0.93 Fitted value (b) LO 5 4 +3 0.94 0.95 Residual 2 -1 -2 (d) 2 Standardized residual -4 10 12 14 16 (e) 18 20 22 24 26 28 Fitted value 7.5 5.0 Standardized residual 2.5 0.0 1.5 2.0 Fitted value 0.0 2.5 5.0 7.5 10.0 12.5 15.0 17.5 Fitted value 0 T 2.5 3.0 10 1.0 1.5 2.0 Fitted value 2.5 3.0