Answer the question correctly please this if for biostatistics class. Show all calculations for a five star rating please.

A pharmaceutical firm sells a prescription drug that alleviates the itching of chicken pox in children. The company wants to bolster its advertising by letting people know how well the drug works. To accomplish this, the firm's research division randomly selects a set of pediatric practices across the country and asks pediatricians to record the number of patients for whom the drug was prescribed in the previous year. They also are asked to record the number of patients whose symptoms were relieved. In all, the researchers find that a total of 857 patients were given the drug and that 651 had relief of symptoms. Using this information compute the 95% confidence interval of the proportion of the children in the population () that have been helped by the drug.