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...Psychology individual differences personality and assessment lecture notes introductory series psychometrics intelligence bias in decision making applied introduction differential dispositional attributes abilities interests background two approaches scientific o experimental vs correlational structure of determinants constructs are latent do they actually exist can be measured is the branch concerned with measurement psychometric tests measure controversial traits users psychological should have an understanding their construction validation error science method has essential component precise assumes that any attribute quantitative demonstration at basis requires units ratio scales sometimes defined by them either ignored or assumed stevens assignment numerals to objects events no numbers rules not like physical sciences we know there a literature based on testing theories coherent useful perhaps interval scale true zero even though different from natural it seems powerful good only ...