Five measurements are taken of the octane rating for a particular type of gasoline. The results (in percent) are 87.0, 86.0, 86.5, 88.0, 85.3.
Find a 95% prediction interval for a single measurement. Find a tolerance interval for the pH that includes 90% of the measurements with 99% confidence.
Notes Ch. 2 Two Common Problems Requiring Information About Tests o One of the common practical problems is finding info about a particular test o Two contexts of this problem: One hears about a test, knows little about it, and needs info about its characteristics One needs to determine what tests might be available to serve a particular purpose A Test’s Introductory Kit o You found a test, so now you want to examine it and its manuals o Initial inspection is usually based on an introductory kit or specimen set Each kit contains a copy of the basic materials for the test o 9 major sources of info about a test comprehensive lists of tests systematic reviews of published tests electronic listings special-purpose collections books about single tests textbooks on testing professional journals publisher’s catalogs other users of tests Comprehensive Lists of Tests o 3 comprehensive lists of tests o Lists do not evaluate the quality of the test o List 1: Tests in Print VII aka TIP Attempts to list all tests that are commercially published in English o List 2: Tests: A Comprehensive Reference for Assessments in Psychology, Education and Business aka Tests Includes only measures that are publ