If ft denotes the forecast of yt+1 made at time t, then the forecast error is given by:
A. et+1 = ft/yt+1.
B. et+1 = yt+1/ft.
C. et+1 = yt+1 + ft.
D. et+1 = yt+1- ft.
Answer: D
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Answer the following statement true (T) or false (F)