In Testing for Differences Between the Means of Two Independent $H _ { 0 } : \mu _ { 1 } - \mu _ { 2 } = 2$

Multiple Choice

In testing for differences between the means of two independent populations, the null hypothesis is:

A) $H _ { 0 } : \mu _ { 1 } - \mu _ { 2 } = 2$
B) $H _ { 0 } : \mu _ { 1 } - \mu _ { 2 } = 0 .$
C) $H _ { 0 } : \mu _ { 1 } - \mu _ { 2 } > 0$
D) $H _ { 0 } : \mu _ { 1 } - \mu _ { 2 } < 2$