Question 01:

The specificity of the neonatal screening test for PKU is 99%. This means that:
99% of babies with a positive screening test have PKU
99% of babies with a negative screening test do not have PKU
99% of babies with PKU have a positive screening test
99% of babies without PKU have a negative screening test
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Explanation

The specificity of a test is defined as the proportion of people who really do not have the disease who have a negative test result.
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