A study of teenage suicide included a sample of 96 boys and 123 girls between the ages of 12 and 16 years selected scientifically from admissions records to a private psychiatric hospital. Suicide attempts were reported by 18 of the boys and 60 of the girls. We assume that the girls constitute a simple random sample from a population of similar girls and likewise for the boys. When constructing a 99 percent confidence interval for the difference between the two proportions, which of the following steps is incorrect? O (0.3003) + 2.575(0.602) O( p1 - P2) + zy p1(1-p1) P2 ( 1 P2 ) n1 12 (0.1453, 0.4553) (0.3003 ) + 2.5751 (0.4878) (0.5122) (0.1875) (0.8125) 123 + 96