PSY 420 Chapter 6 Book Notes
PSY 420 Chapter 6 Book Notes PSY420
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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