Question: You regressed y versus x and obtained the following results.

Then you used your additional knowledge about the dataset and added dummy and slope dummy variables. New regression results are presented in the table below.

1. Interpret results of the first regression. What part of the presented table suggests that you should consider revising the regression equation?
2. Interpret results of the second regression. Do you think that those results are more reliable and independent variables better explain variation of the dependent variable? Why?
3. What kind of scatterplot would you expect looking only at those regression results?

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