The table below shows the percentage of the U.S. labor force in unions for selected years between 1955 and 2005 .
Year
1955
1960
1965
1970
1975
1980
1985
1990
1995
2000
2005
%
33.2
31.4
28.4
27.3
25.5
21.9
18.0
16.1
14.9
13.5
12.5
b. Make a scatter plot of the data. Which kind of polynomial model seems to be most appropriate?
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