A clinical trial tests a method designed to increase the probability of conceiving a girl. In the study 500 babies were born, and 275 of them were girls. Use the sample data to construct a 99%...

Extracted text: A clinical trial tests a method designed to increase the probability of conceiving a girl. In the study 500 babies were born, and 275 of them were girls. Use the sample data to construct a 99% confidence interval estimate of the percentage of girls born. Based on the result, does the method appear to be effective?