Concept explainers
Many universities and colleges have instituted supplemental instruction (SI) programs, in which a student facilitator meets regularly with a small group of students enrolled in the course to promote discussion of course material and enhance subject mastery. Suppose that students in a large statistics course (what else?) are randomly divided into a control group that will not participate in SI and a treatment group that will participate. At the end of the term, each student’s total score in the course is determined.
- a. Are the scores from the SI group a sample from an existing population? If so, what is it? If not, what is the relevant conceptual population?
- b. What do you think is the advantage of randomly dividing the students into the two groups rather thar letting each student choose which group to join?
- c. Why didn’t the investigators put all students in the treatment group? [Note: The article “Supplemental Instruction: An Effective Component of Student Affairs Programming” (f of College Student Devel 1997: 577-586) discusses the analysis of data from several SI programs.]
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Chapter 1 Solutions
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