The Standard Error Of $\bar { x } _ { 1 } - \bar { x } _ { 2 }$

Multiple Choice

The standard error of $\bar { x } _ { 1 } - \bar { x } _ { 2 }$ is the _____.

A) variance of $\bar { x } _ { 1 } - \bar { x } _ { 2 }$
B) variance of the sampling distribution of $\bar { x } _ { 1 } - \bar { x } _ { 2 }$
C) standard deviation of the sampling distribution of $\bar { x } _ { 1 } - \bar { x } _ { 2 }$
D) difference between the two means