Good catch, and I apologize for the confusion. This was a typo that carried through the question.
With a correct answer of “Z-score,” the explanation should be: A Z-score is a standard score computed by subtracting a child’s score from the test mean score and dividing by the test standard deviation; it is typically based on a mean of 0 (zero), is expressed as standard deviation from the mean, and can be positive or negative. A T-score is derived from the Z-score, based on a mean of 50, and always a positive value. Z-scores and T-scores are often used by test developers to determine cut offs for classifications such as “average,” “below average,” etc. A percentile score indicates the number of children of the same age expected to score lower than the subject child. An age-equivalent score reflects the mean raw score on a test obtained by a group of children in the normative sample at that specific age.
The question should have read: Norm-referenced developmental and motor tests offer a variety of score outputs to interpret a child’s performance on the test. Which statistic below is a standard score used to express a score deviation from a mean of zero and is often associated with a score classification?