APFIVE Pooled Sample Proportion Formula
In a pooled two-proportion z-test where the null hypothesis states that the two proportions are equal, which formula correctly represents the pooled proportion $$p_c$$?
A
$$p_c = \frac{x_1}{n_1} - \frac{x_2}{n_2}$$
B
$$p_c = \frac{x_1 + x_2}{n_1 + n_2}$$
C
$$p_c = \frac{n_1 + n_2}{x_1 + x_2}$$
D
$$p_c = \sqrt{\frac{x_1 \times x_2}{n_1 \times n_2}}$$
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