Abnormalities in the 1980s, 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 signed of an abnormality. is this strong evidence that the risk has increased? perform all of the steps for this significance test listed below.