22. Arandom sample of 487 nonsmokingwomen of normal weight (body mass index between 19.8 and 26.0)

who had given birth at a large metropolitan medical centerwas selected ( The Effects of Cigarette Smoking and Gestational Weight Change on Birth Outcomes in Obese and Normal-WeightWomen, Amer.

J. Public Health, 1997: 591—596). It was determined that 7.2% of these births resulted in children of low birth weight (less than 2500 g). Calculate an upper con dence bound using a con dence level of 99%

for the proportion of all such births that result in children of low birth weight.