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