Hamm v. Smith · ¶143

The estimate produced by a composite-score calculation can be interpreted like any other IQ score. In other words, a composite-score estimate of 70 refects intellectual functioning that is “significantly subaverage.” See Schneider, Oxford Handbook 290–291. And because using multiple scores can increase measurement precision, the standard error for a composite score will often be smaller than that for any constituent test score. Id., at 291; APA Handbook 415–417. The resulting confidence interval for a composite score will thus be narrower. Id., at 417.

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