Question

In a large city A ,20% of a random sample of 900 school boys had a slight physical defect. In another large city B
18.5% of a random sample of 1600 school boys had the same defect .Is the difference between the proportions
significant

Answer 1

Answer:

$n1 = 20 \\ n2 = 18.5 \\ s1 = 900 \\ s2 = 1600 \\ |f | = s2 \div s1 \\ 1600 \div 900 \\ ans = \\1.78$