proportion Definition and 2 Threads

The National Center for Education Statistics monitors many aspects of elementary and secondary education nationwide. Their 1996 numbers are often used as a baseline to assess changes. In 1996, 31% of students reported that their mothers had graduated from college. In 2000, responses from 8368...

Placebo/control group has 800 people. They aren't given the vaccine. 60 of them develop the disease Treatment group has 1000 people. They're given the vaccine. 15 develop the disease It seems there's a formula viz ##\frac{p_1 - p_2}{\sqrt{p (1 - p)}\left(\frac{1}{n_1} + \frac {1}{n_2}\right)}##...