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PSY 420 Chapter 6 Book Notes

by: Samantha Bishop

PSY 420 Chapter 6 Book Notes PSY420

Marketplace > Lenoir-Rhyne University > Psychology > PSY420 > PSY 420 Chapter 6 Book Notes
Samantha Bishop

GPA 3.81

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About this Document

Cover Chapter 6 from book in detail from week 4 of class.
Psychological Assessment
Dr. Gordon Cappelletty
Class Notes
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This 2 page Class Notes was uploaded by Samantha Bishop on Monday September 19, 2016. The Class Notes belongs to PSY420 at Lenoir-Rhyne University taught by Dr. Gordon Cappelletty in Fall 2016. Since its upload, it has received 4 views. For similar materials see Psychological Assessment in Psychology at Lenoir-Rhyne University.


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Date Created: 09/19/16
PSY 420  Chapter Six Book Notes Chapter 6: What is Test Reliability/Precision? (p.149­181) What is Reliability/Precision? P.150­151  Measurement error­ variations in measurement   Reliable test­ one we can trust to measure each person in approximately the same way  every time it is used Three Categories of Reliability Coefficients p.151­158 1.   Test­Retest Method­ a test developer gives the same test to the same group of test­ takers on two different occasions  Correlation­ a statistical technique (discussed in chp.5) Practice effects­ occur when test takers benefit from taking the test the first time  which enables them to solve problems more quickly and correctly the second  time 2.   Alternate Forms Method­ create two tests and the scores are compared using a  correlation Order effects­ changes in test scores resulting from the order in which the tests  were taken  3.   The Internal Consistency Method­ measure of how related the items on the test are to  one another Split­half method­ divided the test into two halves and then compare the set of  individual scores on the first half with the scores on the second half Homogeneous tests­ measuring only one trait or characteristic  Heterogeneous tests­ measuring more than one trait or characteristic   Scorer Reliability/Interscorer Agreement­ the amount of consistency among  scorers’ judgments  Intrascorer Reliability­ whether each clinician was consistent in the way he or she assigned scores from test to test Classical Test Theory p.158­163    Random error­ causes a change in an individual’s test scores  True score­ a value that can never really be known or determined  Random error­ difference between a person’s actual score on a test and that person’s  true score  Systematic error­ a single source of error always increases or decreases the true score  by the same amount The Reliability Coefficient p.163­166  Spearman­Brown Formula  KR­20  Coefficient Alpha  Cohen’s Kappa *DESCRIPTIVE CHART ON P.166* Interpreting Reliability Coefficients p.167­174  Standard error of measurement (SEM)­ index of the amount of inconsistency or error  expected in an individual’s observed test score 68%     ±1 SEM of true score 95%     ±2 SEM of true score 99.7%  ±3 SEM of true score  Confidence intervals­ a range of scores that we confident will include the test taker’s true score  Factors that Influence Reliability p.174­176  The test itself  The test administration  The test scoring  Test takers  Test length  Homogeneity  Test­retest interval Generalizability Theory p.176­178  Concerns how well and under what conditions we can generalize an estimation of  reliability/precision of test scores form one test administration to another


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