PSYC 2250 Lecture Notes - Lecture 5: Discriminant, Law School Admission Test, People Counter

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

Document Summary

All measurement consist of 2 parts: (cid:862)true s(cid:272)ore(cid:863, (cid:862)measure(cid:373)e(cid:374)t error(cid:863) Not satisfied 1 2 3 4 5 6 7 8 9 very satisfied. Assu(cid:373)e relatio(cid:374)ship satisfa(cid:272)tio(cid:374) is sta(cid:271)le o(cid:448)er the short ter(cid:373), a(cid:374)d a perso(cid:374)"s true score = 5. Reliable = scores around 6, 5, 4 (fairly consistent numbers, s(cid:373)all (cid:862)error(cid:863)) Not relia(cid:271)le = s(cid:272)ores 1, 9, 5 (cid:894)large (cid:862)error(cid:863), less relia(cid:271)le(cid:895) Careful placement of recording devices on the body (e. g. , Most common is: pearson product-moment, correlation coefficient, symbol = r. When used to describe reliability, called (cid:862)relia(cid:271)ilit(cid:455) (cid:272)oeffi(cid:272)ie(cid:374)t(cid:863) Negative coefficient, neutral and positive correlation: negative correlation: variables covary in opposite directions, when one decreases the other one increases, positive coefficient: variables covary in the same direction. Measure gives same results at two or more different times. Applies to variables expected or known to be stable (e. g. , personality, iq) If correlation is +. 8 (or higher) then measure is reliable.