Psychology_3083_-_REVISED_Chap_3_SPRING_2008-1

Psychology_3083_-_REVISED_Chap_3_SPRING_2008-1 - Psychology...

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Unformatted text preview: Psychology 3083 Chapter 3 Issues in Psychological Assessment & Measurement Everyone engages N assessmt q day Ex young woman meets a young man looks him over asks ques about his interests & observes his reactions to her- this is an ASSESSMENT PROCEDURE based on this, she may dx him a nerd, hunk or nice guy THEN she will try 2 predict whether or not 2 go out w/him EX demonstrates that: - we all need to * observe others * categorize them * make predictions about their behav -WHY do we make predictions about their behavior * so we can understand them * 2 guide our behav toward them In everyday life * observations are informal haphazard contain value judgments (with biases) * predictions may well be wrong . Assessmt in psych is systematic (is supposed to be) objective & accurate Psych has applied scientific method (empirical observ & measuremt) 2 human activity of assessing & predicting others behavs Review of Psychological Measurement Norms and Standardization- there is need 2 attach meaning 2 measurements SO psychological instruments are standardized- Normed 2- In constructing psycho test, it is given 2 large # of repre people (i.e., if test 2 measure dep, give 2 depressives) & non-depressives this is the standardization gp their scores are test norms Norms- how most people perform on the test EX - depression inventory give 2 depressives their scores become the norms- After test is normed, then score of anyone who takes test later is compared 2 test norms - comparison allows persons score 2 have meaning- Scores have more meaningl when statis transform i.e., allows for est Mean & Std Dev EX - Most famous ex of this type of score transform is IQ. Raw scores are transformed thru stat proced so that X = 100 & sd = 15 3 (Indiv who scores 100 has scored higher than 50% of people in norm sample Indiv who scores 115 has scored higher than 84% of people - - - i.e., 1 sd above mean is 84%-ile) Reliability & Validity * Reliab & Valid help psychos know if tests/measuremts meet criteria 4 scientific acceptability- Reliability- refers to trustworthiness or consistency of a measuring device- - - i.e., same result obtained q time measure is used, Even when diff people use it ( repeatability ) * several methods used to determine test reliability all involve corr coeff Types of Reliability 1. Test-retest does the test give the same answer @ diff times Ex- give gp psychological test & again a month later give them the same test the corr (relationship) b/t their answers 1 st & 2 nd time is test-retest reliability - want corr 2 be high 4 2. Internal consistency aka split1/2 reliability Ex - give gp test and then split test in (oft into even & odd no items) measure corr b/t two halves gives tests internal consistency - - - check 2 see if all items r measuring same thing 3. Observer reliability/interrater reliability do diff people using the same measuring device come up w/similar answers Ex if Johnny & Ted both give the Rorschach to...
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This note was uploaded on 05/10/2010 for the course PSYC 3083 taught by Professor Meche during the Spring '10 term at LSU.

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Psychology_3083_-_REVISED_Chap_3_SPRING_2008-1 - Psychology...

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