Plot the data on airplane shipments
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Plot the data on airplane shipments


(a) Plot the data on airplane shipments.


Plot A    Plot B

(b) Can you see seasonal patterns?

(c) Use MegaStat or Minitab to calculate estimated seasonal Indexes and trend. (Round your answers to 3 decimal places.)

Qtri Index -58.391

Otr2 Index -17.266

Qtr3 Index -45.641

Otrd Index 121.297

(d) In which quarters are shipments highest? Lowest? (You may select more than one answer).

Hint
StatisticsA seasonal pattern prevails upon a series being manipulated by varied seasonal factors. Always, seasonality’s period is known and fixed, therefore, seasonal time series are at times acknowledged as periodic time series. Cyclic patterns prevail upon data exhibit falls and rises. ...
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