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Consider the quarterly electricity production for years 1-4: Year 1      2         3            4 Q1   99   120     139        160 Q2   88   108     127        148 Q3  ...

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Basic Math

Consider the quarterly electricity production for years 1-4:

Year 1     2        3           4
Q1   99   120    139        160
Q2   88   108    127        148
Q3   93   111    131        150
Q4 111   130    152        170

(a) Using a classical additive decomposition, calculate theseasonal component.
(b) Explain how you handled the end points.
(c)  Estimate the trend using a centered movingaverage.

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