Question: Test whether the three interactions significantly improve the regression model. Assume 5% level of significance (hint: test the joint significance of the three interaction terms

Test whether the three interactions significantly improve the regression model. Assume

5% level of significance (hint: test the joint significance of the three interaction terms

using the partial F test. If you reject the null hypothesis, test the contribution of each

interaction separately (using the partial F test) in order to determine which interaction

terms to include in the model).

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