Construct three-period and four-period centered moving averages for the quarterly J. C. Penney sales in Exercise 18.67. Are there any other retailing companies 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 a company.
In exercise

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Gross Sales (Billions) IV 2000 $7.53 7.21 9.57 2001 7.527.27.73 9.54 2002 7.737.27.87 9.55 7.54