A seasonal index for a monthly series is about to be calculated on the basis of the past four years' accumulation of data. The four previous July values were 110, 135, 125, and 130. The four previous total year values were 1440, 1920, 1920, and 2400. 

Calculate the seasonal Index for July.

If the total-year forecast for the next year is 2400. What is the July forecast for next year? 

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To calculate the seasonal index for July 1 Calculate the average of the past fou... View the full answer