Psychology 2080A/B Lecture Notes - Lecture 2: Mean Squared Error, Greek Alphabet, English Alphabet

• School: Western University
• Department: Psychology
• Course: Psychology 2080A/B
• Professor: Rachel Plouffe

Document Summary

Chapter 2 norm and basic statistics for testing. Why do we need stats: descriptive stats: purposes of description, summarize data and evaluate observations relative to others (observed within our samples) Possi(cid:271)le i(cid:374)flue(cid:374)(cid:272)es o(cid:374) ja(cid:373)ie"s e(cid:454)a(cid:373) g(cid:396)ade: t1, t2, etc. If the e(cid:454)a(cid:373) has q"s f(cid:396)o(cid:373) those pages, g(cid:396)ade (cid:373)a(cid:455) (cid:271)e lo(cid:449)e(cid:396)ed: r2 = a friend buys jamie coffee before the exam higher blood-caffeine level & greater wakefulness during most of the exam, r1, r2, etc. Ja(cid:373)ie"s e(cid:454)a(cid:373) s(cid:272)o(cid:396)e (cid:396)efle(cid:272)ts (cid:271)oth he(cid:396) t(cid:396)ue a(cid:271)ilit(cid:455) a(cid:374)d the i(cid:374)flue(cid:374)(cid:272)e of (cid:396)a(cid:374)do(cid:373) events. Measures of variability: whenever we work with a mean, we must consider the variation of scores around that mean. If someone tells you an average (salary for lawyers, grades for this course, etc. ) they must also tell you how variable the data points are: range: difference between highest and lowest scores in a set. E. g. s = 38/(4-1) = 38/3 = 3. 56.