A First-Order Autoregressive Model for Stock Sales Is $\text { Sales } _ { i } = 800 + 1.2 \left( \text { Sales } )_ { i - 1 } \right. \text {. }$

Short Answer

A first-order autoregressive model for stock sales is: $\text { Sales } _ { i } = 800 + 1.2 \left( \text { Sales } )_ { i - 1 } \right. \text {. }$ .
If sales in 2012 is 6,000, the forecast of sales for 2013 is __________.