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Direct linkGlassman, Jill R.; Potter, Susan C.; Baumler, Elizabeth R.; Coyle, Karin K. – Health Education & Behavior, 2015
Introduction: Group-randomized trials (GRTs) are one of the most rigorous methods for evaluating the effectiveness of group-based health risk prevention programs. Efficiently designing GRTs with a sample size that is sufficient for meeting the trial's power and precision goals while not wasting resources exceeding them requires estimates of the…
Descriptors: Health Education, Longitudinal Studies, Correlation, Comparative Analysis
Hoffman, August John; Wallach, Julie; Sanchez, Eduardo; Afkhami, Hasti – Community College Enterprise, 2009
The current study sought to determine if community based gardening projects would reduce perceptions of the need to use communication devices--cell phones or text messaging--and increase the likelihood of participating in future volunteer projects. Results strongly support the predictions in that the experimental group post-test mean score of the…
Descriptors: Experimental Groups, Control Groups, Interpersonal Communication, Service Learning
Hoffman, August; Wallach, Julie – Community College Enterprise, 2007
The purpose of the current study is to explore the effects of community service work and community involvement on perceptions of self-entitlement--expectations of others to do things for oneself--among undergraduate students. Over the course of a 16-week semester, 26 randomly selected subjects (20 community college psychology students and six…
Descriptors: Control Groups, Undergraduate Students, Community Involvement, Service Learning
