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TIME SERIES QUESTION 4 [25 MARKS] The following shows the Thermostat Sales. Weekly Thermostat Sales 206 189 255 245 244 303 185 209 282 169

TIME SERIES

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QUESTION 4 [25 MARKS] The following shows the Thermostat Sales. Weekly Thermostat Sales 206 189 255 245 244 303 185 209 282 169 207 291 162 211 280 177 210 255 207 173 312 216 194 296 193 234 307 230 156 281 212 206 308 192 188 280 162 162 345 1. Comment on the trend of the time series above. 2. Which smoothing method can be used in this case? (2) 3. Given a = 0.2 and B = 0.1, find the estimates of the smoothed values L, and the trend estimate by. (20)

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