PSY 310 Chapter Notes -Variance, Agreeableness, Takers
Document Summary
Reliability: consistency in measurement, the proportion of the total variance attributed to true variance, people"s observed scores are mostly determined by their true scores, the test is reliable. Scores may be affected by error related to the state of test takers (such as practice, fatigue, etc) or item sampling: parallel forms. Variance and measurement error: variance, standard deviation squared, variance = true variance + error variance. Influence test scores in a consistent direction; either consistently inflate scores or consistently deflate scores: methodological error. Interviewers may not have been trained properly, the wording in the questionnaire may have been ambiguous, or the items may have somehow been biased to favor one or another of the candidates. Item response theory: provides a way to model the probability that a person with x ability will be able to perform at a level of y. Irt refers to a family of methods and techniques used to distinguish specific approaches.
