PSYC 201W Lecture Notes - Lecture 5: Statistical Conclusion Validity, Statistical Inference, Construct Validity

• School: Simon Fraser University
• Department: Psychology
• Course: PSYC 201W
• Professor: Russell Day

Document Summary

Research validity: truthfulness of inferences made from a research study. 4 types: statistical conclusion validity, construct validity, internal validity, external validity, statistical conclusion validity, validity with which we can infer that the iv and dv co-vary, answers if the iv and dd co-vary. Threats: participant reactivity to experimental situation subjects motives, tendencies tat may effect their responses or perceptions. Influenced by demand characteristics: primary motive (positive self-presentation). > cause (iv) must be related to effect (dv). > changes in iv must precede changes in dv (temporal). > no other plausible explanation must exist for the effect: primary threat: cofounding extraneous variables, extraneous variables and cofounding extraneous variables (co-occurs with iv and affects dv). (ie. Iv - tutoring, dv - students grades, cv of ev - honours class): can eliminate cv of ev by holding their influence constant or using random assignment to balance their influence. Types: population validity, can generalize across people from target population, target population vs.