History a source of causal invalidity that occurs when something other than the

History a source of causal invalidity that occurs

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7.History – a source of causal invalidity that occurs when something other than the treatment influences outcome scores (effect of external events) 8.Contamination – a source of causal invalidity that occurs when either the experimental and/or comparison group is aware of the other group and is influenced in the posttest as a result (competitiveness for compensatory rivalry) 9.Experimenter expectancy 8. What is a double-blind experiment? (p.150) Why is it necessary? (p.150) (book) 9. What is the Solomon four-group design? (p.153-154) What major threat to internal validity does it specifically address? (book and lecture)
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10. Be able to define key terms for the chapter. (see Key Terms)
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  • Fall '08
  • Call,V
  • Qualitative Research, Causality

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