PSYC 2001 Lecture Notes - Lecture 6: Negative Relationship, External Validity, Blind Experiment

• School: Carleton University
• Department: Psychology
• Course: PSYC 2001
• Professor: Jordan Schoenherr

Document Summary

Comparing 2 or more sets of scores. Reseach design: group vs individual, same individuals vs different individuals, number of variables to be included. Threat to external validity: generalization from a sample to the general population, generalization from one research study to another, generalization from a research study to a real-world situation. Validity and the quality of a research study. Category 1: generalizing across participants/subjects: selection bias, college students, volunteer bias, participant characteristics, cross-species generalizations. Category 2: generalizing across features of a study: novelty effect, multiple treatment interference, fatigue, practice, experimenter characteristics. Category 3: generalizing across features of the measures: sensitization/assessment sensitization, pretest sensitization, generality across response measure, time of measurement. Extraneous variables, confounding variables, and internal validity. Environmental variables: general threats to internal validity for all studies. Individual differences: threats ti internal validity for studies comparing different groups. Time-related variables: threats to internal validity for studies comparing one group over time: more about internal and external validity.