"A researcher estimates the model $Y[t]=b0+b1*$ trend $+$ error $t,$ where $Y[t]$ refers to a variable at time $t$ in years, and $b0$ and $b1$ are constants. Using this model, the $2-$ period ahead conditional mean forecast for $Y[t+2]$ is given by $($Hint: today is year $t,$ you are forecasting $Y$ for $2$ years into the future$)."$

bo

$b0+b1$

$b0+b1$ trend

trend $+2$