Sub: Statistics Topic: Testing
Analyze the given data and testing the difference for t test for dependent
groups using SPSS and give conclusions and an interpretation.
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HUDM 5123 Lab 1: Dependent groups t-test (RB-2 design)
This lab asks you to analyze a simple matched-groups design in two ways: using the
dependent groups t test, and analyzing the same data as a randomized blocks design with p=2
levels of the within-subjects factor (using SPSS’s GLM procedure).
In this study, the researcher is studying the effect of participation in an afterschool
program on problem behaviors (e.g. smoking, risky sex) in teens. Because participants in the
program are volunteers, rather than being randomly assigned to conditions, the group of
participating teens differs in a number of ways from non-participants most importantly in a
composite measure of “social/academic risk.” The researcher decides to try to control for
group differences by matching pairs of students, one participant with one non-participant, with
similar risk scores. Fifteen matched pairs of students are created, so the total number of
students followed is N=30. After three months of program, the scores of participants and non-
participants are compared (the dependent variable is a composite measure of problem
behaviors, Y, obtained by summing severity measures across a set of target behaviors).