forecasting techniques

An analyst must decide between two different forecasting techniques for weekly sales of roller blades: a linear trend equation and the naive approach. The linear trend equation is F t = 124 + 2 t, and it was developed using data from periods 1 through 10. Based on data for periods 11 through 20 as shown in the table, which of these two methods has the greater accuracy if MAD and MSE are used?

t Units Sold 11 147 12 148 13 151 14 145 15 155 16 152 17 155 18 157 19 160 20 165