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Consider the following (generic) population regression model: Yi = β0 + β1X1,i + β2X2,i + β3X3,i...

Consider the following (generic) population regression model:
Yi = β0 + β1X1,i + β2X2,i + β3X3,i + ui, i = 1,...,n . Transform the regression to allow you to easily test the null hypothesis that β1 + β3 = 1. State the new null hypothesis associated to this transformed regression.

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