PSYC 2250 Lecture Notes - Lecture 14: Internal Validity

• School: University of Manitoba
• Department: Psychology
• Course: PSYC 2250
• Professor: Steven Hladkyj

Document Summary

Internal validity: when experiment is reliable and valid: external validity: generalizing the results beyond the experiment. Participants typically not selected from the general population. 68% of participants are in the top journals. High need for peer approval, unstable peer relationships, social and political attitudes in flux. More highly educated, more social, less neurotic, more conscientious. Used to include predominantly white participant samples, now more culturally diverse. Operation definitions of concepts must be grounded in culture. Experimenters influence on participants must remain constant throughout e experiment. Experimenter personality characteristics and gender can also affect participants (warm vs cold) Solutions: use two or more experimenters how. In real world pretests are rarely given so results might not generalize. Can use solomon four group design to assess any interaction between the iv and pretest variables. Lab and field studies contribute to a greater understanding of human behaviour. An attempt to replicate precisely the procedures of the study.