What is the probability that a mother smokes at the time of delivery if the dried blood

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What is the probability that a mother smokes at the time of delivery if the dried blood specimen is ≥ 5 ng/mL? 


Suppose it is estimated based on a large sample of births in California that 20% of mothers smoke at the time of delivery.


Suppose the screening test for detecting whether a mother smokes at the time of pregnancy is based on a cutoff of ≥ 5 ng/mL using dried blood specimens from the newborn.

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