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

Short Answer

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) $H _ { 0 } : \mu _ { 1 } - \mu _ { 2 } < 2$ .