PSYC 3020 Study Guide - Midterm Guide: Takers, Face Validity
Document Summary
Week 10 tests and measures chapter 12. 5 most variation: item discrimination, discrimination index: a statistic that compares the performance of those who made very high test scores and those who made very low test scores on each item. Neg or small positive bad item: item-total correlations, correlation between scores on a single item and overall test scores. Negative or weak correlation bad item: interitem correlations, interitem correlation matrix: a matrix that displays the correlation of each item with every other item, phi coefficient: statistic that describes the relationship between teo dichotomous variables. 4: item-criterion correlations, relationship between performance on the items and performance on a criterion measure. Should yield the same distribution of scores: 3. individual rank-ordering of scores should be identical, 4. Number of items a minimally qualified person would answer correctly. Based on correlation between test scores and criterion: compiling the test manual, purpose of test development, history of development process, results of validation study.
