The Standard Error of the Difference Between Means Is Given $\sqrt { \frac { \left( \sigma _ { 1 } \right) ^ { 2 } } { n _ { 1 } } + \frac { ( \sigma ) ^ { 2 } } { n _ { 2 } } }$

Multiple Choice

The standard error of the difference between means is given by

A) $\sqrt { \frac { \left( \sigma _ { 1 } \right) ^ { 2 } } { n _ { 1 } } + \frac { ( \sigma ) ^ { 2 } } { n _ { 2 } } }$
B) $\frac { \sigma _ { 1 } } { n _ { 1 } } + \frac { \sigma _ { 2 } } { n _ { 2 } }$
C) $\frac { \left( \sigma _ { 1 } \right) ^ { 2 } } { n _ { 1 } } + \frac { ( \sigma } { n _ { 2 } } L ^ { 2 }$
D) $\sqrt { \frac { \sigma _ { 1 } } { n _ { 1 } } + \frac { \sigma _ { 2 } } { n _ { 2 } } }$