Construct four-period and five-period centered moving averages for the quarterly residential gas sales in Exercise 18.69. Are
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In exercise
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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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