Question: Problem 4 The data for this problem are the air freight shipments (in ton-miles) each month (beginning in January for one year) in the U.

Problem 4 The data for this problem are the air freight shipments (in ton-miles) each month (beginning in January for one year) in the U. S. for 10 years. The following is a time series plot of this data. What are the most important features of this plot? Time Series Plot of Ton-miles 3000 2500 Ton-miles 2000 1500 1000 1 12 24 36 48 60 72 84 96 108 120 Index
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