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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: = 698.9 - 2.28 × STR
and = 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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