. In the 1980's it was generally believed that congenital abnormalities affected about 5% of the nation's children. Some people
believe that the increase in the number of chemicals in the environment has led to an increase in the incidence of abnormalities. A recent study examined 384 children and found that 46 of them showed signs of an abnormality. Is this strong evidence that the risk has increased?
1 answer:
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