CSCD 2201 Study Guide - Pearson Product-Moment Correlation Coefficient, Statistical Power, Measuring Instrument

• School: Temple University
• Department: Communication Sciences and Disorders
• Course: CSCD 2201
• Professor: Stefanatos

Document Summary

Reliability: index of the consistency of a measuring instrument in repeatedly providing the same score for a given participant. Internal consistency reliability: index of the homogeneity of the items of a measure. Test re-test reliability: index of the consistency in scores over time, range of . 8=stable. Split half reliability: a measure of consistency where a test is split in two and the scores for each half of the test is compared with one another. If the test is consistent it leads the experimenter to believe that it is most likely measuring the same thing. This is not to be confused with validity where the experimenter is interested if the test measures what it is supposed to measure. Reliability index: correlation coefficients quantify test-retest and interrater reliability, ranging from -1. 00 to +1. 00 (although negative correlations for reliability are unlikely unless something is seriously wrong like raters using different rating scales) .