Quarter Seasonal Index Q1 73 Q2 83.4 Q3 108.6     Remember that the seasonal indices should average 100 so you should be able to infer the seasonal index for Q4.   Furthermore, suppose that the estimated coeffcients from a regression of the deseasonalized series on Time are given below:     Coefficients Intercept 2,148 Time 58.2 If the original value of the series in a Q1 was 2,18

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