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Consider estimating the effect of personal computer ownership, as represented by a binary variable, PC, on...

Consider estimating the effect of personal computer ownership, as represented by a binary variable, PC, on college GPA, colGPA. With data on SAT scores and high schoool GPA you postulate the model: colGPA = β0 + β1hsGPA + β2SAT + β3PC+u

If variable z can be used as a proxy, explain how to conduct an estimation. Are the estimated coefficients consistent?

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