What is the formula to use that deals with a comparison of two population means so I can propose either a confidence interval or a hypothesis test question that compares these two means. I ask 30 girls if they would like a small pet, specifically a chihuahua, and 25 said yes. I asked 25 boys if they would like a small chihuahua and 10 said yes. So what is the formula I would use to see if the data indicates that the proportions that said yes are different for girls and boys at a 5% level of significance what is the process for me to give a 95% confidence interval for the difference between the two proportions?