Explain how you would test the null hypothesis that ₁ = 0 in the multiple regression model Y₁ = Bo + B1X1i + B2X2i + u₁. Explain how you would test the null hypothesis that 0. Why = B₂ = 0. Explain how you would test the joint hypothesis that B₁ = 0 and B₂ isn't the result of the joint test implied by the results of the first two tests?

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