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5. Consider the bi-variate linear regression model: Y = B, + B,X, + B,X, + u. Show how the model can be transformed in order to test the following null hypotheses involving single restrictions with a t- test versus an F-test. Also, after you have transformed the models, specify the null hypothesis that will be tested; that is, the null that is equivalent to the original null. A. Ho: B, = B2 B. Ho: B, + 28, = 0