iii) Using the regression line found in 

ii) determine 3rd year demand. 

iv) Forecast the rounded-off monthly demand for each of the months of the third year.

Sales of a telephone answering machine for the last two years are given below: Year Jan Feb Mar April May Jun Jul Aug Sep 210 220 1 180 175 180 190 195 2 190 180 185 198 202 215 230 i) Find the seasonal index for each of the months. ii) Find the least square regression line y = a + bx; where b Oct Nov 200 198 202 195 185 210 195 196 205 xy-n.xy ;a=y-bx; x-x Dec 190