PSYC 2250 Lecture Notes - Lecture 12: Birth Order, Partial Correlation, Test Anxiety

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

Document Summary

To make inferences for the sample to the population (external validity) Recall scales of measurement: four types, nominal, simple coding of categories, no ordering (no inherent meaning, ordinal, ordered, ranked, measures magnitude and direction, but are not comparable quantities, (cid:862)al(cid:449)a(cid:455)s(cid:863) is (cid:374)ot (cid:1008)(cid:454) (cid:862)(cid:374)e(cid:448)e(cid:396)(cid:863) Interval: equidistant, no true zero, numbers have order and intervals are equal. Intelligence: golf scores, celsius temperature, magnitude, direction, and comparable quantities, ratio, order, equidistant, has true absolute zero, magnitude, direction, comparable and a zero is a true possibility, k temperature, # of siblings. Sometimes difficult to decide if a scale is ordinal or interval: e. g. Sad 1 2 3 4 5 happy: ordinal: has magnitude and direction. Interval : but are the values comparable: ofte(cid:374) useful to assu(cid:373)e that (cid:396)ati(cid:374)g s(cid:272)ales (cid:894)e. g. ate o(cid:374) a s(cid:272)ale f(cid:396)o(cid:373) (cid:862)(cid:1005) . (cid:1011)(cid:863) a(cid:396)e. Interval: statistically more can be done with them, assumption of continuity, making an assumption that there is a 1. 2, 3. 5etc, exception: rank-ordered scales, e. g.