The 2 Proportions conducts a hypothesis test of the difference between two proportions and calculates a confidence interval.
|Test||Null Hypothesis, H0||Alternate Hypothesis, H1|
|One-tailed||p1 - p2 = p0||p1 - p2 < p0 or p1 - p2 > p0|
|Two-tailed||p1 - p2 = p0||p1 - p2 ≠ p0|
where p1 and p2 are the proportions of success in populations 1 and 2 respectively, and p0 is the hypothesized difference between the two proportions.