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How can this forecasting problem be solved if done by hand instead of excel? What equations must be solved?? Show work please thank you so much!

Zeus Computer Chips, Inc., used to have major contracts to produce the Centrino-type chips. The market has been declining during the past three years because of the dual-core chips, which it cannot produce, so Zeus has the unpleasant task of forecasting next year. The task is unpleasant because the firm has not been able to find replacement chips for its product lines. Here is demand over the past 12 quarters: LAST YEAR THIS YEAR Vo YEARS AGo 4,800 3,500 4,300 3,000 3,500 2,700 3,500 2,400 3,200 2,100 2,700 1,700 Use the decomposition technique to forecast demand for the next four quarters.

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Answer #1
S L R=S/L AVG R FOR EACHQ F-L*QUATERLY INDEX S-F
SALES LINE RATIO INDEX FORECAST ERROR
2007.0 Q1

1

4800 4235.900 1.133 11 4776.7 23.27
2007.0 Q2 2 3500 4032.400 0.68 0.9 346.3 31.74
2007.0 Q3 3 4300 3828.900 1123 12 4480.7 -180.72
2007.0 Q4 4 3000 3625.400 0.827 0.8 3060.2 -60.16
2008.0 Q1 5 3500 3421.900 1161 12 3528.1 -358.80
2008.0 Q2 6 2700 321.400 0.839 0.9 2768.1 -68.14
2008.0 Q3 7 3500 3014.900 1161 2 3528.1 -28.15
2008.0 Q4 8 2400 211.400 0.854 0.8 2373.1 26.93
2009.0 Q1 9 3200 2607.900 1227 1 2940.9 259.13
2009.0 Q2 10 2100 2404.400 0.73 0.9 206. 31.98
2009.0 Q3 11 2700 2200.900 1227 12 2575.6 124.43
2009.0 Q4 12 1700 1997.400 0.851 0.8 1686.0 14.02
2010 Q1 13 1793.900 11 2022.9
2010.0 Q2 14 1590.400 0.9 1367.9
2010.0 Q3 15 113.400 0.8 998.9
2010 Q4 16 113.400 0.8 998.9Book26- Excel Sign in -0 Insert Page Layout FormulasData Review View Add-ins Tell me what you want to do AutoSum A Cut A 一二三9
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