Michelle Dawson and Her Colleagues Gave Children and Adults with Autism

Multiple Choice

Michelle Dawson and her colleagues gave children and adults with autism and a matched group of individuals without autism a Wechsler-based intelligence test and the Raven's Progressive Matrices test. What were the results of this research?

A) On average, the autistic group scored fully 30 percentile points lower on the Raven's test than on the Wechsler test.
B) On average, the autistic children scored at the 26th percentile on the Wechsler test while their average score was 56 percent on the Raven's test.
C) Members of the matched non-autistic control group achieved significantly lower scores on both tests than did the autistic group.
D) Autistic children and adults scored below the 25th percentile on both tests.