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Margin of Error

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Last updated 23 April 2013 11:59 by NZTecAdmin

The Margin of Error is an indication of how robust the learners result is. It relates to the level of difficulty the assessment questions take in relation to the learner’s ability. This indicates the precision of the score and gives a range within which to be reasonably sure that the student's true achievement level lies - i.e. if a learner has a Scale Score of 534 +/- 29 and they then sat a similar assessment, the learner would likely score between 505 and 563.

However, a learner who correctly answers all or nearly all of the questions in a non-adaptive assessment will be located above the scale locations of most of the assessment questions. This is because it is most likely that the learner is capable of answering many questions that are more difficult than the particular questions that were administered. This will result in a large margin of error related to their scale score.



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