In Using the Z-Test for Comparing Two Proportions, the Null $\pi$

Multiple Choice

In using the Z-test for comparing two proportions, the null hypothesis is typically stated as ____.

A) $\pi$ 1 = $\pi$ 2.
B) $\pi$ 1 $\neq$ $\pi$ 2.
C) $\pi$ 1 x $\pi$ 2 = 1
D) $\pi$ 1 - $\pi$ 2 = 1