The quarterly sales data (number of copies sold) for a college textbook over the past three years follow. a. Compute the linear trend equation for the deseasonalized data (to 2 decimal if necessary). Deseasonalized Value = + Period Compute the forecast sales using the linear trend equation (to 1 decimal). Forecast for quarter 1 Forecast for quarter 2 Forecast for quarter 3 Forecast for quarter 4 b. Adjust the linear trend forecasts using the adjusted seasonal indexes computed in part (c) (to the nearest whole number). Forecast for quarter 1 Forecast for quarter 2 Forecast for quarter 3 Forecast for quarter 4
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