In Testing for Differences Between the Means of Two Related $H _ { 0 } : \mu _ { D } = 2.$

Multiple Choice

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

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