PSYC 332 Study Guide - Midterm Guide: Social Desirability Bias, Spurious Relationship, Nonprobability Sampling
9 Jul 2015
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Correlations measure the degree that two variables co-vary, or are associated with each other. Variables are not manipulated, free to vary, and measured. Positive correlation r = coefficient measuring the strength of the relationship between two variables. : when the values of one variable go up, values on another. Negative correlation variable go down e. g. temperature and amount of clothing variable go down e. g. temperature and amount of clothing e. g. height and distance from head to ceiling. : self-selection individuals select themselves into a group, causing a biased sample with nonprobability sampling. Partial correlation : measure x & z, control for y. Can help rule out 3rd variable problem. But still problem of reverse causality e. g. weather, happiness, and social activity (3 variables) Happiness r = 1. 00 r = . 66* r = 1. 00. Temperatur e r = 1. 00 r = . 16 (not significant)
