The trend equation is Ft = 80+15t
Where Ft = Annual sales in thousands
t = sequential number of the year
a) Annual sales are increasing by 15 thousand bottles per year.
b) If 1990 corresponds to period 0,2006 is period 16. So for year 2006 t=16.
Ft= 80+15t = 80+(15×16) = 80+240 = 320
So annual sales for 2006 using the equation are 320 thousands
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