100%(3)3 out of 3 people found this document helpful
This preview shows page 4 - 6 out of 13 pages.
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 expectancy8. 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)
10. Be able to define key terms for the chapter. (see Key Terms)