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Your Textbook Extends the Simple Regression Analysis of Chapters 4  TestScore ^\widehat{\text { TestScore }}

Question 41

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Your textbook extends the simple regression analysis of Chapters 4 and 5 by adding an additional explanatory variable, the percent of English learners in school districts (PctEl). The results are as follows:  TestScore ^\widehat{\text { TestScore }} = 698.9 - 2.28 × STR
and  TestScore^\widehat{\text { TestScore} } = 698.0 - 1.10 × STR - 0.65 × PctEL
Explain why you think the coefficient on the student-teacher ratio has changed so dramatically (been more than halved).

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This is a good example of omitted variab...

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