13. Gender Selection The Genetics and IVF Institute conducted a clinical trial of its methods for gender selection. As this book was written, results included 325 babies born to parents using the XSORT method to increase the probability of conceiving a girl, and 295 of those babies were girls. Also, 51 babies were born to parents using the YSORT method to increase the probability of conceiving a boy, and 39 of those babies were boys.

a. Construct a 95% confidence interval estimate of the difference between the proportion of girls and the proportion of boys.

b. Does there appear to be a difference? Does the XSORT method appear to be effective?

Does the YSORT method appear to be effective?