In the 1980's it was generally believed around 5% of all children in the U. S. were affected by congenital abnormalities. Some people believe that the increase in chemicals in the environment has led to an increase in the proportion of children in the U. S. with congenital abnormalities. A recent study examined 384 randomly selected children in the U. S. and found that 23 had congenital abnormalities. Is this enough evidence to state the proportion of all children in the U. S. with congenital abnormalities is more than 0.05