Construct four-period and five-period centered moving averages for the quarterly revenues in Exercise 18.71. Are there any other entertainment or recreation companies for whom a four-period moving average might have such a great effect on smoothing quarterly revenue data? If so, give a real or hypothetical example of such a company.
In exercise

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Quarter 1998 $1.260 1.244 504 524 1999 1.434 1.408 7 1.553 2000 577 57 940 1.715 2001 1.729 650 946 1.684 2002 1.433 .525 1847 .660