Pooled Sample Proportion Formula

Question

In a pooled two-proportion z-test, the null hypothesis is that the two population proportions are equal. Which of the following formulas correctly represents the pooled sample proportion, $$p_c$$?

Accepted Answer

$$p_c = \frac{x_1 + x_2}{n_1 + n_2}$$

Answer

$$p_c = \sqrt{\frac{x_1 	imes x_2}{n_1 	imes n_2}}$$

Answer

$$p_c = \frac{n_1 + n_2}{x_1 + x_2}$$

Answer

$$p_c = \frac{x_1}{n_1} - \frac{x_2}{n_2}$$

Pooled Sample Proportion Formula

Question Leaderboard