Say that you are an analyst for a chain of restaurants, and you are studying the lunch hour
sales for a restaurant in a location at a distant mall. The mall is surrounded by corporations
that provide a steady lunchtime clientele during the week. On the weekends, the mall does
well in the holiday shopping months but lacks weekend crowds during the rest of the year.
From the data contained in the chart in Figure I.1, you can spot a periodicity in sales
throughout the year. An estimated 50 spikes indicate that the periodicity might be based on
the day of the week. You can also spot that there is a ...
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