Question: If we focus on a simple regression analysis relating colGPA to ACT only, we obtain: colGPA ( h a t ) = 2 . 4

If we focus on a simple regression analysis relating colGPA to ACT only, we obtain:

colGPA

(h a t) = 2.40 + . 0271

ACT

Thus, the estimate for ACT is almost three times as large as the previous estimate based on a model additionally controlling hsGPA. Discuss why we have the different estimate for ACT.

If we focus on a simple regression analysis relating colGPA to

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