Week $1=1000$

Week $2=1200$

Week $3=1400$

Week $4=$ Predict using the Exponential Smoothing Forecast $($Smoothing Constant Alpha $=0\mathrm{.}1$

Exponential Sir oothing

$F_{t+1}=D_t+(1-)F_t$

where:

$F_{t+i}=$ forecast for time period $t+1($i$.$e$,$ the new forecast$)$

$F_i=$ forecast for time period $t($i$.$e$,$ the current forecast$)$

$D_t=$ actual value for time period $t$

$=$ smoothing constant used to weight $D_t$ and $)(1$

$1540\mathrm{.}0$

$1378\mathrm{.}1$

$1600\mathrm{.}0$

$1130\mathrm{.}9$

$1500\mathrm{.}0$