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

question 161

True/False

The variance of $\bar { x } _ { 1 } - \bar { x } _ { 2 }$ is $V \left( \bar { x } _ { 1 } - \bar { x } _ { 2 } \right) = \frac { \sigma _ { 1 } ^ { 2 } } { n _ { 1 } } - \frac { \sigma _ { 2 } ^ { 2 } } { n _ { 2 } }$ .

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