3 IQ tests are given to fifteen pairs of siblings In each pa

3. IQ tests are given to fifteen pairs of siblings. In each pair, one sibling has phenylketonuria (PKU, a metabolism disorder); the other doesn\'t. Is there any evidence that, in general, the PKU cases have higher or lower IQs from their siblings? Perform a nonparametric test with sufficient power, and justify your choice of test

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