An analyst must decide between two different forecasting techniques for weekly sales of roller bladest a linear trend equation and the naive approach. The linear trend equation is Ff=124+2t, and it was developed using data from periods I through 10 . Based on data for periods 11 through 20 as shown in the table. For linear trend forecasting approach, you can forecast the demand from period 11 to period 20 . For naive approach, you can forecast the demand from period 12 to period 20. (a) Calculate MAD and MSE for the naive approach. (b) Calculate MAD and MSE for libear tend appeoach. (c) Based on part (a) and part (b) results, which forecasting method (ie., naive approach or linear trend approach) is mose appropriate in this