Countess Company trades in bars of Golden Tree Chocolate from Tema Cocoa processing company limited. The number of bars of chocolate sold per quarter over a four-year period by Countess Company is;
YEAR QUARTER 1 QUARTER 2 QUARTER 3 QUARTER 4
1 20 10 4 11
2 33 17 9 18
3 45 23 11 25
4 60 30 13 29
Required:
i) Plot the data on a graph. (3 marks)
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ii) Calculate a linear regression trend equation for the data. (5 marks)
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iii) Calculate the four seasonal components using a multiplicative model. (5 marks)
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iv) Forecast the number of bars of chocolate for the next two years. (5 marks)
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v) Comment on the reliability of years forecasts in iv) above. (2 marks)
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Forecast values in iv) above are not reliable because they are extrapolations. i.e. forecast beyond the range of the data.