Question: Construct four-period and five-period centered moving averages for the quarterly residential gas sales in Exercise 18.69. Are there any other energy industries for whom a

Construct four-period and five-period centered moving averages for the quarterly residential gas sales in Exercise 18.69. Are there any other energy industries for whom a four-period moving average might have such a great effect on smoothing quarterly sales data? If so, give a real or hypothetical example of such an industry.
In exercise

Residential Gas Sales (Trillions of Cubic Feet) 2005 2329 2006 2042 2007 2317 2008 2351 784 700 761 762 353 349 346 345 IV 1360 1277 1294 1408

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