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  | This web page was last updated at 09/28/99 08:18 PM 
 
        Why are second-order models of interest (i.e. why not just use
          first-order models only)?
        Graph an example of second-order model
          (E(Y) = b0
          + b1X
          + b2X2)
          when b2<0.
           
              
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