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Question $4$

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

In the equation above $F_t$ refers to:

a$.$ The last period's alpha weighting

b$.$ The last period's forecast error

c$.$ The last period's actual value

d$.$ The last period's forecast

$4.\frac{?}{{?}_{\frac{?}{?}}}$ Moving to another question will save this response.