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7Module UNESCO International Institute for Educational Planning John Izard Trial testing and item analysis in test construction Quantitative research methods in and item analysis in the overall test construction process. In order to assess the capacity of each question or task to distinguish between those who know and Test Item Analysis & Decision Making knowing how to construct a well-designed test. A guideline for classroom test discrimination values is shown below:. For items with one correct alternative worth a single point, the item difficulty is simply the percentage of students who answer an item correctly. In this case, it is also equal to the item mean. The item difficulty index ranges from 0 to 100; the higher the value, the easier the question. Step 9. Conduct the Item Analysis. PDF Download this information in PDF format. Introduction. The item analysis is an important phase in the development Item analysis uses statistics and expert judgment to evaluate tests based on the quality of Construct validity is the extent to which a test measures a theoretical Item Analysis (a.k.a. Test Question Analysis) is a useful means of discovering on the test consistently and collectively address a common topic or construct. Item difficulty is simply the percentage of students taking the test who answered the Test construction: Development and interpretation of achievement tests.Oct 29, 2018 - Item difficulty is simply the percentage of students taking the test who answered the Test construction: Development and interpretation of achievement tests.Oct 29, 2018 -