1. Hypothesis Tests for Two Population Proportions
Format 2
Two-Tailed Test
Upper One-Tailed Test
Lower One-Tailed Test

2. Hypothesis Tests for Two Population Proportions
POOLED ESTIMATOR FOR OVERALL PROPORTION
where: x1 and x2 = number from samples 1 and 2 with desired characteristic.

3. Hypothesis Tests for Two Population Proportions
TEST STATISTIC FOR DIFFERENCE IN POPULATION PROPORTIONS
where:
(1 - 2) = Hypothesized difference in proportions from populations 1 and 2, respectively
p1 and p2 = Sample proportions for samples selected from population 1 and 2
= Pooled estimator for the overall proportion for both populations combined

4. Hypothesis Tests for Two Population Proportions (Example 9-8)
Rejection Region  = 0.05
Since z =-2.04 < , reject H0