d$.$ Using initial estimates of $120$ for the average value and $10$

for the trend, apply exponential smoothing with trend

retrospectively to last year's sales. Use all combinations of the

smoothing constants where $\backslash$alpha $=0\mathrm{.}1,0\mathrm{.}3,$ or $0\mathrm{.}5$ and $\backslash$beta $=0\mathrm{.}1,0\mathrm{.}3,$

or $0\mathrm{.}5.$ Compare both MAD and MSE for these nine

combinations.

e$.$ Which one of the above. forecasting methods would you

recommend that management use? Using this method, what is

the forecast of total sales for January of the new year?