PSY 2301 Lecture Notes - Lecture 5: External Validity, Internal Validity, Psy

• School: University of Iowa
• Department: Psychology
• Course: PSY 2301
• Professor: Teresa Treat

Document Summary

Psy:2301 - lecture 5 - research methods in clinical psychology. *note: this lecture is all in context of sexual assault on college campuses. Potential correlations between msi and sa risk (n=17) (n=sample size) Strong negative correlation (r= -. 70): relates to c graph. Strong positive correlation (r= +. 70): relates to a graph. No correlation (r= 0. 0): relates to b graph. As msi increases, sa risk stays the same. When compared to case studies, correlational studies show higher internal validity and higher external validity. Very hard to be confident about causality. Causal arrows may go in any direction. Ex: internal validity weaker than in experimental designs, because we are less sure about causal conclusions. E(cid:454)a(cid:373)i(cid:374)e effe(cid:272)t of e(cid:454)peri(cid:373)e(cid:374)tall(cid:455) (cid:373)a(cid:374)ipulated (cid:862)i(cid:374)depe(cid:374)de(cid:374)t (cid:448)aria(cid:271)le(cid:863) (cid:894)iv(cid:895) o(cid:374) (cid:862)depe(cid:374)de(cid:374)t (cid:448)aria(cid:271)le(cid:863)/(cid:863)(cid:272)riterio(cid:374) (cid:448)aria(cid:271)le(cid:863) (cid:894)dv(cid:895) a(cid:272)ross (cid:373)ultiple perso(cid:374)s. E(cid:454): e(cid:448)aluate (cid:449)hether (cid:373)a(cid:374)ipulated le(cid:448)el of al(cid:272)ohol (cid:272)o(cid:374)su(cid:373)ptio(cid:374) i(cid:374)flue(cid:374)(cid:272)es (cid:373)e(cid:374)"s per(cid:272)eptio(cid:374)s of (cid:449)o(cid:373)e(cid:374)"s se(cid:454)ual i(cid:374)terest. Iv: al(cid:272)ohol (cid:272)o(cid:374)su(cid:373)ptio(cid:374) dv: per(cid:272)eptio(cid:374) of sexual interest. Relative to case and correlational studies, internal validity increases.