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Unformatted text preview: Based on what you know about economics and biological invasion, make an argument for why this quantity should (or should not) be related to a countrys invadedness. 3. (20 points) Would you feel justified in removing any of the independent variables from the model in part 1? Why or why not? 4. (20 points) For simplicity, create a new variable which is the product of GDP and M_imports. Run a model where this is the only independent variable. Is this model better than the model you ran in the previous microexam (using GDP)? Why or why not? 5. (10 points) Examine the variables in the dataset, and identify one or more that you think might influence invadedness (you can construct your own variables that represent sensible combinations of the dataset variables, if you wish). List these variables, and explain why you think each of them might be important. 6. (20 points) Add the new variables to the model from part 4. Is your new model better? Why or why not?...
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 Spring '08
 KENDALL,BERKLEY
 Environmental Science

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