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).
Definitions:
Incestuous
Involving sexual relations between close relatives who are forbidden by law or cultural norms to marry.
Economic Unit
A group of individuals, typically members of a family, seen as a single entity for economic and financial analysis.
Emotionally Committed
Describes a state of being deeply invested in a relationship or cause, involving significant emotional attachment and dedication.
Living Together
The arrangement whereby individuals share a common living space without being married or otherwise legally committed to each other.
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