Regression model, Y$=42\mathrm{.}6+3\mathrm{.}2$X$,$ where Y is the number of surgeries and X is

the index for the year $($e$.$g$.,$ X$=1$ for year $1,$ X$=2$ for year $2,$ etc.$)$

a$.$ If MAD is the performance criterion chosen by the administration, which

forecasting method should it choose?

b$.$ If MSE is the performance criterion chosen by the administration, which

forecasting method should it choose?

c$.$ If MAPE is the performance criterion chosen by the administration, which

forecasting method should it choose?