It is the examinee's IQ

In response to the question "Whose IQ is it?" raised by McDermott, Watkins, and Rhoad (2014), this study examined the same concern about assessor bias by applying hierarchical linear modeling to a large and representative standardization sample of 2,200 child records in the Wechsler Intelligence Scale for Children, Fourth Edition (WISC-IV). When differences in child age, gender, ethnicity, parental education level, and some intellectual abilities were cojointly used as covariates to adjust for nonrandom assignment problems, the results revealed that the Level 2 assessor variance was trivial for Full Scale IQ and all WISC-IV scores, ranging from 1%-5%, with the only exception being the Comprehension subtest, which showed a moderate level of between-assessor variance (10%). Evidence shows that WISC-IV scores are valid measures of children's intellectual abilities, with no evidence showing harmful assessor bias.