Historically in the united states, slightly less than half of newborns have been girls. This worksheet illustrates the process of creating a confidence interval and investigates how sample size affects such an interval 1.To learn more about the proportion of U. S babies who are girls, suppose we take a random sample of 100 newborn babies in the United states and fine 48% of them are girls. Define the parameter of interest, including the symbol used to denote it