The following data describe U.S. manufacturers shipments of general aviation jet aircraft from 1979 through 1998: a.

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The following data describe U.S. manufacturers€™ shipments of general aviation jet aircraft from 1979 through 1998:

Year Shipments Shipments Year 1979 282 1989 157 1980 326 1990 168 1981 389 1991 186 259 1982 1992 171 198 1983 142 1993

a. Construct a graph of the time series. Does the overall trend appear to be upward or downward?
b. Determine the three-year and five-year centered moving average curves and superimpose each on the original time series.

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