Answer: Many universities and colleges have instituted

Chapter 1, Problem 5

(choose chapter or problem)

Many universities and colleges have instituted supplementalinstruction (SI) programs, in which a student facilitatormeets regularly with a small group of students enrolled inthe course to promote discussion of course material andenhance subject mastery. Suppose that students in a largestatistics course (what else?) are randomly divided into acontrol group that will not participate in SI and a treatmentgroup that will participate. At the end of the term, eachstudents total score in the course is determined.a. Are the scores from the SI group a sample from anexisting population? If so, what is it? If not, what isthe relevant conceptual population?b. What do you think is the advantage of randomlydividing the students into the two groups rather thanletting each student choose which group to join?c. Why didnt the investigators put all students in the treatmentgroup? [Note: The article SupplementalInstruction: An Effective Component of StudentAffairs Programming (J. of College Student Devel.,1997: 577586) discusses the analysis of data fromseveral SI programs.]

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