In Comparing the Difference of the Means Between Two Groups $\mu$

Multiple Choice

In comparing the difference of the means between two groups, the null hypothesis can also be stated as ____.

A) $\mu$ 1 - $\mu$ 2 = 0
B) $\mu$ 1 + $\mu$ 2 = 0
C) $\mu$ 1 x $\mu$ 2 = 0
D) $\mu$ 1 / $\mu$ 2 = 0