A local retailer is thinking of using exponential smoothing to forecast one of his well-selling products. His problem is that he is not sure if he should use a low or a high value of a.

For this reason, he uses the historical data available and tries with values for a = 0.1 and a = 0.2 to find which value for a will give a smaller MAD. What are the MAD values he would arrive at?

WEEK ACTUAL SALES 1 95 2 110 3 120 4 98 5 112 6 95 7 105 8 130 9 70 10 80 11 110