ERIC Number: ED235206
Record Type: RIE
Publication Date: 1983-Jul
Reference Count: 0
Confidence and Tolerance Intervals for True Scores. ACT Technical Bulletin, Number 42.
Issues regarding confidence and tolerance intervals are discussed within the context of educational measurement. Conceptual distinctions are drawn between these two types of intervals; and examples, under various error and true score models, are used to compare such intervals. It is shown that there tend to be only small differences in tolerance intervals under different true score models. It is also demonstrated that confidence and tolerance intervals are not only quite distinct conceptually, but also can be very different numerically. Points are raised about the usefulness of tolerance intervals when the focus is on a particular observed score rather than a particular examinee. (Author)
Descriptors: Educational Testing, Measurement Techniques, Models, Scores, Statistical Analysis, Test Interpretation
Research and Development Division, The American College Testing Program, P.O. Box 168, Iowa City, IA 52243.
Publication Type: Reports - Research
Education Level: N/A
Authoring Institution: American Coll. Testing Program, Iowa City, IA. Research and Development Div.
Identifiers: Confidence Intervals (Statistics); Tolerance Intervals (Statistics)