90%(215)193 out of 215 people found this document helpful
This preview shows page 43 - 44 out of 93 pages.
influencing external validity are subtle and may not be reported in research reports; however, the researcher must be responsible for these factors. Generalization is usually narrower for a single study than for multiple replications of a study using different samples, perhaps from different populations in different settings.DIF:Cognitive Level: AnalysisREF:Page 2028.Why does subject attrition affect internal validity?DIF:Cognitive Level: SynthesisREF:Page 2009.Aside from random assignment using a large sample, what are ways to structure a design that control for known extraneous variables? (Select all that apply.)