Iowa Achievement Tests is a norm-referenced test, which means a student’s performance is compared with that of a group of similar students who have taken the same test across the nation. Student scores are reported in relation to the scores of this “norm” group. Statistically, the majority of students nationwide will be in the 50th-percentile range.
The average score on the Iowa Achievement Test, regardless of grade level or content area is the 50th percentile. This score means that in a random sample of 100 students in the norming, we would expect approximately 49 to score lower than 50 and 50 to score higher. Iowa Achievement Test results are reported in percentile rankings, not in percentage of answers correct.
Iowa Achievement Tests data is also used to help teachers know more about student skills in specific areas like fractions, decimals, vocabulary and comprehension.
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