Figure 1.115 shows quarterly US beer production during the period 2013 to 2015. Quarter 1 reflects production during the first three months of each year, etc.
(a) Explain why a periodic function should be used to model these data.
(b) Approximately when does the maximum occur? The minimum? Why does this make sense?
(c) What are the period and amplitude for these data?

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millions of barrels 60 55 50 45 40 quarter-years 1 2 3 4 1 2 3 4 1 2 3 4 (2013-2015) Figure 1.115