Many universities and colleges have instituted supplementalinstruction (SI) programs, in

Chapter 1, Problem 5

(choose chapter or problem)

Many universities and colleges have instituted supplementalinstruction (SI) programs, in which a student facilitator meetsregularly with a small group of students enrolled in thecourse to promote discussion of course material and enhancesubject mastery. Suppose that students in a large statisticscourse (what else?) are randomly divided into a control groupthat will not participate in SI and a treatment group that willparticipate. At the end of the term, each students total scorein the course is determined.a. Are the scores from the SI group a sample from an existingpopulation? If so, what is it? If not, what is the relevantconceptual population?b. What do you think is the advantage of randomly dividingthe students into the two groups rather than letting eachstudent choose which group to join?c. Why didnt the investigators put all students in the treatmentgroup? Note: The article Supplemental Instruction:An Effective Component of Student Affairs Programming(J. of College Student Devel., 1997: 577586) discussesthe analysis of data from several SI programs.