Question: 14.1 Go back to Example 14.1 and use the data for monthly department store sales to estimate a quadratic trend model. Use the estimated model

14.1 Go back to Example 14.1 and use the data for monthly department store sales to estimate a quadratic trend model. Use the estimated model to obtain an extrapolated value for sales for April 1974. Try to evaluate your model in comparison to the other four estimated in Example 14.1, and explain how and why your forecast for April differs from the other forecasts in the example.

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