1. In Spring 2017, the professors who teach the large sections of Econ 201 redesigned all of the homework assignments. T

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1. In Spring 2017, the professors who teach the large sections
of Econ 201 redesigned all of the homework assignments. The
professors who teach the small sections of Econ 201 did not make
any changes. Let’s say that I want to figure out the effect of the
homework redesign on final grades in large Econ 201. I collect data
on final grades, number of credits completed overall by each
student, grades in other Econ courses, whether the individual is an
Econ major, whether the student took large or small 201, and what
semester the student took the course for all sections of Econ 201
taught from Fall 2015 to Spring 2019.
(a) What type of data have I collected? Explain.
(b) Write down a regression model that provides an estimate of
the average difference in final grades between students in large
and small sections, controlling for credits completed and whether
the student is a major, respectively.
(c) For some reason, some semesters go better than others.
Assuming that thispattern is true for all courses offered in a
semester, add to your model in Question b to account for this type
of pattern
(d) Adapt your model in Question c
to provide an estimate of the effect of the redesigned homework
assignments on students in large enrollment courses, measured
relative to students in small courses where there was no
change.
(e)Broadly speaking, what must be
true about the students in the large and smallcourses,
respectively, for your model in Question d to be interpreted as
causal?