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Z scores are used for standardized testing done by most school districts.
It is the most common way of standardizing data. IQ scores can be standardized using z scores. The mean is 100 and the standard deviation is 15.
You use the t score when the sample is small, <30 often. Many behavior ratings use t scores.
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Earn +20 ptsQ: Uses of t-score and z-score in the classroom?
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