Find and identify the four seasonal factors for quarters 1, 2, 3, and 4. International Machinery, Inc.,

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Find and identify the four seasonal factors for quarters 1, 2, 3, and 4.


International Machinery, Inc., produces a tractor and wishes to use quarterly tractor sales data observed in the last four years to predict quarterly tractor sales next year. The following MegaStat output gives the tractor sales data and the estimates of the seasonal factors and trend line for the data:

Centered Sales, y Deseasonalized Ratio to Seasonal Moving Average Sales, y Indexes Year Quarter CMA 293 1.191 245.9 392

800 y = 19.95x + 220.54 700 R? = 0.9965 600 500 400 300 200 100 4 12 16 Quarter Sales, y Deseasonalized Linear (Deseason

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Business Statistics In Practice Using Data Modeling And Analytics

ISBN: 9781259549465

8th Edition

Authors: Bruce L Bowerman, Richard T O'Connell, Emilly S. Murphree

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