APFIVE Pooled Sample Proportion Formula
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, $$p_c$$?
A
$$p_c = \sqrt{\frac{x_1 \times x_2}{n_1 \times n_2}}$$
B
$$p_c = \frac{n_1 + n_2}{x_1 + x_2}$$
C
$$p_c = \frac{x_1 + x_2}{n_1 + n_2}$$
D
$$p_c = \frac{x_1}{n_1} - \frac{x_2}{n_2}$$
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