User:Globber

$$z= \frac{\hat p_1-\hat p_2}{\sqrt{\hat p\hat q (\frac{1}{n_1}+\frac{1}{n_2})}}$$

$$z= \frac{.65-.43}{\sqrt{.54\times.46 (\frac{1}{4006}+\frac{1}{3315})}}$$