(a) Plot the data on airplane shipments. (b) Can you see seasonal patterns? Explain. (c) Use MegaStat or Minitab to calculate estimated seasonal indexes and trend. (d) In which quarters are shipments highest? Lowest? Can you suggest reasons? (e) Is there a trend in the deseasonalized data?
Note: Quarterly shipments may not add to annual total because some manufacturers report only annual totals. Source: U.S. Manufactured General Aviation Shipments, Statistical Databook, General Aviation Manufacturers Association, used with permission. Source: “U.S. Manufactured General Aviation Shipments,” Statistical Databook, General Aviation Manufacturers Association. Note that quarterly shipments may not add to annual total because some manufacturers report only annual totals.
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