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(Solved) The following table shows the past two years of quarterly sales


The following table shows the past two years of quarterly sales information. Assumes that there are both trend and seasonal factors and that the seasonal cycle is 1 year.

QUARTER    SALES

1                  160

2                  195

3                  150

4                  138

5                  219

6                  235

7                  208

8                 185


Use time series decomposition to forecast quarterly sales for the next year (next four quarters). Can you please explain how to do each step not using excel.


Use time series decomposition to forecast quarterly sales for the next year (next four quarters).

 

Quarter (X)

 


 

Total

 

Average

 


 

1

 

2

 

3

 

4

 

5

 

6

 

7

 

8

 

36

 


 

4.5

 


 

Actual

 

Sales (Y)

 

160

 

195

 

150

 

138

 

219

 

235

 

208...

 


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Oct 15, 2019

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