Discussion question limiting validity
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To prepare for this Discussion, review the handout, A Short Course in Statistics and pages 210–220 in your course text (Dudley, J. R. (2014). Social Work Evaluation: Enhancing What We Do). If necessary, locate and review online resources concerning internal validity and threats to internal validity. Then, review the “Social Work Research: Chi Square” case study( located below). Consider the confounding variables, that is, factors that might explain the difference between those in the program and those waiting to enter the program. Answer the following:
- an interpretation of the case study’s conclusion that “the vocational rehabilitation intervention program may be effective at promoting full-time employment.”
- Describe the factors limiting the internal validity of this study and explain why those factors limit the ability to draw conclusions regarding cause and effect relationships.
Reference:
Dudley, J. R. (2014). Social work evaluation: Enhancing what we do. (2nd ed.) Chicago, IL: Lyceum Books.
- Chapter 9, “Is the Intervention Effective?” (pp. 226–236: Read from “Determining a Causal Relationship” to “Outcome Evaluations for Practice”)
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