Using data in problem 5-30 develop a multiple regression model to predict sales (both trend and seasonal components) using dummy variables to incorporate the seasonal factor into the model. Use this model to predict sales for each quarter of the next year. Comment on the accuracy of this model.
Quarter
Year 1
Year 2
Year 3
Year 4
1.
218
225
234
250
2.
247
254
265
283
3.
243
255
264
289
4.
292
299
327
356
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