Health Sciences 2801A/B Study Guide - Final Guide: Standard Score, Confidence Interval, Observational Error
24 Dec 2017
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Document Summary
Internal consistency concerned with unsystematic error in the scores obtained using a multiple indicator instrument. Unsystematic error a type of measurement error that increases or decreases individual scores by an unpredictable amount. True score a hypothetical score on the construct in the absence of measurement error. Confidence interval describes the probable range of true scores associated with an observed score and is placed around an adjusted observed score (xa). Item universe the large, hypothetical collection of indicators. Adjusted observed score the adjustment addresses positive bias in observed scores that fall above the mean and negative bias in observed scores that fall below the mean. Margin of error (me = zsem) determines the width of a confidence interval and is used to calculate a confidence interval. Level of confidence determined using a z score of 1. 96 for 95% and 1. 64 for 90%. 1. 96 z score used for a 95% confidence interval. 1. 64 z score used for a 90% confidence interval.
